{
  "name": "DERATE heavy-duty truck fault code library",
  "publisher": "VARGER Group LLC",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "DERATE / VARGER Group LLC",
  "source": "https://derate.app/data",
  "date_modified": "2026-10-10",
  "notes": "severity is DERATE's own triage classification; derates is a yes/no flag only (no level or percentage); price ranges are estimated USD market ranges for the part only, no labor, not a quote. Informational, not a substitute for a mechanic.",
  "count": 112,
  "rows": [
    {
      "code": "P2002",
      "slug": "p2002",
      "system": "Aftertreatment / DPF",
      "title": "DPF efficiency below threshold",
      "severity": "YELLOW",
      "derates": true,
      "part": "DPF cleaning (or filter if cracked)",
      "price_low_usd": 400,
      "price_high_usd": 4500,
      "source": "base_library",
      "url": "https://derate.app/code/p2002",
      "lang": "en"
    },
    {
      "code": "SPN 3242",
      "slug": "spn-3242",
      "system": "Aftertreatment / DPF",
      "title": "DPF intake temperature",
      "severity": "YELLOW",
      "derates": false,
      "part": "DPF temperature sensor",
      "price_low_usd": 90,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3242",
      "lang": "en"
    },
    {
      "code": "SPN 3246",
      "slug": "spn-3246",
      "system": "Aftertreatment / DPF",
      "title": "DPF outlet temperature",
      "severity": "YELLOW",
      "derates": false,
      "part": "DPF temperature sensor",
      "price_low_usd": 90,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3246",
      "lang": "en"
    },
    {
      "code": "SPN 3251 FMI 0",
      "slug": "spn-3251-fmi-0",
      "system": "Aftertreatment / DPF",
      "title": "Particulate filter",
      "severity": "YELLOW",
      "derates": true,
      "part": "DPF differential pressure sensor",
      "price_low_usd": 180,
      "price_high_usd": 420,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-3251-fmi-0",
      "lang": "en"
    },
    {
      "code": "SPN 3719",
      "slug": "spn-3719",
      "system": "Aftertreatment / DPF",
      "title": "DPF soot load",
      "severity": "YELLOW",
      "derates": true,
      "part": "DPF cleaning (or filter if cracked)",
      "price_low_usd": 400,
      "price_high_usd": 4500,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3719",
      "lang": "en"
    },
    {
      "code": "P0299",
      "slug": "p0299",
      "system": "Air intake / Turbo",
      "title": "Turbo underboost",
      "severity": "YELLOW",
      "derates": true,
      "part": "Turbo (VGT) actuator",
      "price_low_usd": 600,
      "price_high_usd": 2200,
      "source": "reviewed_database",
      "url": "https://derate.app/code/p0299",
      "lang": "en"
    },
    {
      "code": "SPN 102 FMI 18",
      "slug": "spn-102-fmi-18",
      "system": "Air intake / Turbo",
      "title": "Boost pressure",
      "severity": "YELLOW",
      "derates": true,
      "part": "Boost pressure sensor",
      "price_low_usd": 60,
      "price_high_usd": 260,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-102-fmi-18",
      "lang": "en"
    },
    {
      "code": "SPN 105",
      "slug": "spn-105",
      "system": "Air intake / Turbo",
      "title": "Intake manifold temperature",
      "severity": "YELLOW",
      "derates": false,
      "part": "Intake manifold temperature sensor",
      "price_low_usd": 40,
      "price_high_usd": 180,
      "source": "base_library",
      "url": "https://derate.app/code/spn-105",
      "lang": "en"
    },
    {
      "code": "SPN 641",
      "slug": "spn-641",
      "system": "Air intake / Turbo",
      "title": "Turbo actuator (VGT)",
      "severity": "YELLOW",
      "derates": true,
      "part": "Turbo (VGT) actuator",
      "price_low_usd": 600,
      "price_high_usd": 2200,
      "source": "base_library",
      "url": "https://derate.app/code/spn-641",
      "lang": "en"
    },
    {
      "code": "SPN 171",
      "slug": "spn-171",
      "system": "Ambient",
      "title": "Ambient air temperature",
      "severity": "WHITE",
      "derates": false,
      "part": "Ambient air temperature sensor",
      "price_low_usd": 25,
      "price_high_usd": 120,
      "source": "base_library",
      "url": "https://derate.app/code/spn-171",
      "lang": "en"
    },
    {
      "code": "SPN 441",
      "slug": "spn-441",
      "system": "Auxiliary",
      "title": "Auxiliary temperature",
      "severity": "WHITE",
      "derates": false,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "base_library",
      "url": "https://derate.app/code/spn-441",
      "lang": "en"
    },
    {
      "code": "SPN 597",
      "slug": "spn-597",
      "system": "Brakes / ABS",
      "title": "Brake switch",
      "severity": "RED",
      "derates": false,
      "part": "Brake light / pedal switch",
      "price_low_usd": 25,
      "price_high_usd": 140,
      "source": "base_library",
      "url": "https://derate.app/code/spn-597",
      "lang": "en"
    },
    {
      "code": "SPN 598",
      "slug": "spn-598",
      "system": "Brakes / ABS",
      "title": "Clutch switch",
      "severity": "YELLOW",
      "derates": false,
      "part": "Clutch pedal switch",
      "price_low_usd": 25,
      "price_high_usd": 140,
      "source": "base_library",
      "url": "https://derate.app/code/spn-598",
      "lang": "en"
    },
    {
      "code": "SPN 789 FMI 7",
      "slug": "spn-789-fmi-7",
      "system": "Brakes / ABS",
      "title": "Trailer ABS",
      "severity": "RED",
      "derates": null,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-789-fmi-7",
      "lang": "en"
    },
    {
      "code": "SPN 1067",
      "slug": "spn-1067",
      "system": "Brakes / ABS",
      "title": "ABS event",
      "severity": "RED",
      "derates": false,
      "part": "ABS modulator valve / ECU",
      "price_low_usd": 250,
      "price_high_usd": 1500,
      "source": "base_library",
      "url": "https://derate.app/code/spn-1067",
      "lang": "en"
    },
    {
      "code": "SPN 84",
      "slug": "spn-84",
      "system": "Chassis",
      "title": "Wheel-based vehicle speed",
      "severity": "YELLOW",
      "derates": false,
      "part": "Wheel speed sensor",
      "price_low_usd": 40,
      "price_high_usd": 180,
      "source": "base_library",
      "url": "https://derate.app/code/spn-84",
      "lang": "en"
    },
    {
      "code": "P0128",
      "slug": "p0128",
      "system": "Cooling",
      "title": "Thermostat below regulating temp",
      "severity": "WHITE",
      "derates": false,
      "part": "Thermostat",
      "price_low_usd": 60,
      "price_high_usd": 320,
      "source": "base_library",
      "url": "https://derate.app/code/p0128",
      "lang": "en"
    },
    {
      "code": "SPN 110 FMI 0",
      "slug": "spn-110-fmi-0",
      "system": "Cooling",
      "title": "High temperature",
      "severity": "RED",
      "derates": true,
      "part": "Coolant temperature sensor",
      "price_low_usd": 40,
      "price_high_usd": 180,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-110-fmi-0",
      "lang": "en"
    },
    {
      "code": "SPN 111",
      "slug": "spn-111",
      "system": "Cooling",
      "title": "Coolant level",
      "severity": "YELLOW",
      "derates": false,
      "part": "Coolant level sensor",
      "price_low_usd": 40,
      "price_high_usd": 200,
      "source": "base_library",
      "url": "https://derate.app/code/spn-111",
      "lang": "en"
    },
    {
      "code": "P0401",
      "slug": "p0401",
      "system": "EGR",
      "title": "EGR flow insufficient",
      "severity": "YELLOW",
      "derates": false,
      "part": "EGR valve",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/code/p0401",
      "lang": "en"
    },
    {
      "code": "SPN 27",
      "slug": "spn-27",
      "system": "EGR",
      "title": "EGR valve position",
      "severity": "YELLOW",
      "derates": true,
      "part": "EGR valve",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/code/spn-27",
      "lang": "en"
    },
    {
      "code": "SPN 411",
      "slug": "spn-411",
      "system": "EGR",
      "title": "EGR differential pressure",
      "severity": "YELLOW",
      "derates": true,
      "part": "EGR differential pressure sensor",
      "price_low_usd": 90,
      "price_high_usd": 320,
      "source": "base_library",
      "url": "https://derate.app/code/spn-411",
      "lang": "en"
    },
    {
      "code": "SPN 412",
      "slug": "spn-412",
      "system": "EGR",
      "title": "EGR temperature",
      "severity": "YELLOW",
      "derates": false,
      "part": "EGR temperature sensor",
      "price_low_usd": 60,
      "price_high_usd": 220,
      "source": "base_library",
      "url": "https://derate.app/code/spn-412",
      "lang": "en"
    },
    {
      "code": "SPN 2791",
      "slug": "spn-2791",
      "system": "EGR",
      "title": "EGR valve control",
      "severity": "YELLOW",
      "derates": true,
      "part": "EGR valve",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/code/spn-2791",
      "lang": "en"
    },
    {
      "code": "P0562",
      "slug": "p0562",
      "system": "Electrical / J1939",
      "title": "System voltage low",
      "severity": "YELLOW",
      "derates": false,
      "part": "Alternator",
      "price_low_usd": 300,
      "price_high_usd": 1200,
      "source": "base_library",
      "url": "https://derate.app/code/p0562",
      "lang": "en"
    },
    {
      "code": "SPN 168",
      "slug": "spn-168",
      "system": "Electrical / J1939",
      "title": "Battery / charging voltage",
      "severity": "YELLOW",
      "derates": false,
      "part": "Alternator",
      "price_low_usd": 300,
      "price_high_usd": 1200,
      "source": "base_library",
      "url": "https://derate.app/code/spn-168",
      "lang": "en"
    },
    {
      "code": "SPN 620",
      "slug": "spn-620",
      "system": "Electrical / J1939",
      "title": "5V sensor supply",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor supply wiring / harness repair",
      "price_low_usd": 40,
      "price_high_usd": 400,
      "source": "base_library",
      "url": "https://derate.app/code/spn-620",
      "lang": "en"
    },
    {
      "code": "SPN 627",
      "slug": "spn-627",
      "system": "Electrical / J1939",
      "title": "ECU power supply",
      "severity": "YELLOW",
      "derates": false,
      "part": "ECM power / ground circuit repair",
      "price_low_usd": 40,
      "price_high_usd": 500,
      "source": "base_library",
      "url": "https://derate.app/code/spn-627",
      "lang": "en"
    },
    {
      "code": "SPN 639 FMI 2",
      "slug": "spn-639-fmi-2",
      "system": "Electrical / J1939",
      "title": "Data bus",
      "severity": "YELLOW",
      "derates": false,
      "part": "J1939 datalink repair (connector / terminating resistor)",
      "price_low_usd": 20,
      "price_high_usd": 350,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-639-fmi-2",
      "lang": "en"
    },
    {
      "code": "SPN 1231",
      "slug": "spn-1231",
      "system": "Electrical / J1939",
      "title": "J1939-1 datalink",
      "severity": "YELLOW",
      "derates": false,
      "part": "J1939 datalink repair (connector / terminating resistor)",
      "price_low_usd": 20,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/code/spn-1231",
      "lang": "en"
    },
    {
      "code": "SPN 2003",
      "slug": "spn-2003",
      "system": "Electrical / J1939",
      "title": "Transmission datalink",
      "severity": "YELLOW",
      "derates": false,
      "part": "Transmission harness / connector",
      "price_low_usd": 80,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/code/spn-2003",
      "lang": "en"
    },
    {
      "code": "SPN 51",
      "slug": "spn-51",
      "system": "Engine",
      "title": "Throttle position",
      "severity": "YELLOW",
      "derates": false,
      "part": "Throttle position sensor",
      "price_low_usd": 80,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/code/spn-51",
      "lang": "en"
    },
    {
      "code": "SPN 91",
      "slug": "spn-91",
      "system": "Engine",
      "title": "Accelerator pedal position",
      "severity": "YELLOW",
      "derates": true,
      "part": "Accelerator pedal assembly",
      "price_low_usd": 180,
      "price_high_usd": 650,
      "source": "base_library",
      "url": "https://derate.app/code/spn-91",
      "lang": "en"
    },
    {
      "code": "SPN 98",
      "slug": "spn-98",
      "system": "Engine",
      "title": "Engine oil level",
      "severity": "YELLOW",
      "derates": false,
      "part": "Oil level sensor",
      "price_low_usd": 60,
      "price_high_usd": 260,
      "source": "base_library",
      "url": "https://derate.app/code/spn-98",
      "lang": "en"
    },
    {
      "code": "SPN 190",
      "slug": "spn-190",
      "system": "Engine",
      "title": "Engine speed",
      "severity": "YELLOW",
      "derates": false,
      "part": "Crankshaft position sensor",
      "price_low_usd": 60,
      "price_high_usd": 280,
      "source": "base_library",
      "url": "https://derate.app/code/spn-190",
      "lang": "en"
    },
    {
      "code": "SPN 512",
      "slug": "spn-512",
      "system": "Engine",
      "title": "Driver's demand torque",
      "severity": "WHITE",
      "derates": false,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "base_library",
      "url": "https://derate.app/code/spn-512",
      "lang": "en"
    },
    {
      "code": "SPN 1569 FMI 31",
      "slug": "spn-1569-fmi-31",
      "system": "Engine",
      "title": "Torque derate",
      "severity": "RED",
      "derates": true,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-1569-fmi-31",
      "lang": "en"
    },
    {
      "code": "P0088",
      "slug": "p0088",
      "system": "Fuel",
      "title": "Rail pressure too high",
      "severity": "RED",
      "derates": true,
      "part": "Fuel pressure regulator / relief valve",
      "price_low_usd": 150,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/code/p0088",
      "lang": "en"
    },
    {
      "code": "SPN 94",
      "slug": "spn-94",
      "system": "Fuel",
      "title": "Fuel delivery pressure",
      "severity": "YELLOW",
      "derates": true,
      "part": "Fuel filter (primary + secondary)",
      "price_low_usd": 40,
      "price_high_usd": 160,
      "source": "base_library",
      "url": "https://derate.app/code/spn-94",
      "lang": "en"
    },
    {
      "code": "SPN 97",
      "slug": "spn-97",
      "system": "Fuel",
      "title": "Water in fuel",
      "severity": "WHITE",
      "derates": false,
      "part": "Water separator filter",
      "price_low_usd": 30,
      "price_high_usd": 120,
      "source": "base_library",
      "url": "https://derate.app/code/spn-97",
      "lang": "en"
    },
    {
      "code": "SPN 157",
      "slug": "spn-157",
      "system": "Fuel",
      "title": "Injector rail pressure",
      "severity": "YELLOW",
      "derates": true,
      "part": "Fuel rail pressure sensor",
      "price_low_usd": 120,
      "price_high_usd": 450,
      "source": "base_library",
      "url": "https://derate.app/code/spn-157",
      "lang": "en"
    },
    {
      "code": "SPN 651",
      "slug": "spn-651",
      "system": "Fuel",
      "title": "Injector cylinder 1",
      "severity": "YELLOW",
      "derates": false,
      "part": "Fuel injector (one)",
      "price_low_usd": 350,
      "price_high_usd": 1200,
      "source": "base_library",
      "url": "https://derate.app/code/spn-651",
      "lang": "en"
    },
    {
      "code": "SPN 100 FMI 1",
      "slug": "spn-100-fmi-1",
      "system": "Lubrication",
      "title": "Oil pressure",
      "severity": "RED",
      "derates": false,
      "part": "Oil pressure sensor",
      "price_low_usd": 50,
      "price_high_usd": 240,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-100-fmi-1",
      "lang": "en"
    },
    {
      "code": "P20EE",
      "slug": "p20ee",
      "system": "SCR / DEF",
      "title": "SCR efficiency below threshold",
      "severity": "YELLOW",
      "derates": true,
      "part": "SCR catalyst",
      "price_low_usd": 1500,
      "price_high_usd": 6000,
      "source": "base_library",
      "url": "https://derate.app/code/p20ee",
      "lang": "en"
    },
    {
      "code": "SPN 3055",
      "slug": "spn-3055",
      "system": "SCR / DEF",
      "title": "Aftertreatment intake NOx",
      "severity": "YELLOW",
      "derates": true,
      "part": "NOx sensor (inlet / engine-out)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3055",
      "lang": "en"
    },
    {
      "code": "SPN 3216",
      "slug": "spn-3216",
      "system": "SCR / DEF",
      "title": "SCR intake NOx sensor",
      "severity": "YELLOW",
      "derates": true,
      "part": "NOx sensor (inlet / engine-out)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3216",
      "lang": "en"
    },
    {
      "code": "SPN 3226",
      "slug": "spn-3226",
      "system": "SCR / DEF",
      "title": "SCR outlet NOx sensor",
      "severity": "YELLOW",
      "derates": true,
      "part": "NOx sensor (outlet / tailpipe)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3226",
      "lang": "en"
    },
    {
      "code": "SPN 3361",
      "slug": "spn-3361",
      "system": "SCR / DEF",
      "title": "DEF dosing unit",
      "severity": "YELLOW",
      "derates": true,
      "part": "DEF dosing unit (pump / supply module)",
      "price_low_usd": 700,
      "price_high_usd": 2800,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3361",
      "lang": "en"
    },
    {
      "code": "SPN 3364 FMI 18",
      "slug": "spn-3364-fmi-18",
      "system": "SCR / DEF",
      "title": "DEF quality",
      "severity": "YELLOW",
      "derates": true,
      "part": "DEF tank drain & refill (contaminated fluid)",
      "price_low_usd": 80,
      "price_high_usd": 350,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-3364-fmi-18",
      "lang": "en"
    },
    {
      "code": "SPN 3516",
      "slug": "spn-3516",
      "system": "SCR / DEF",
      "title": "DEF concentration",
      "severity": "YELLOW",
      "derates": true,
      "part": "DEF quality / level sensor (tank header)",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/code/spn-3516",
      "lang": "en"
    },
    {
      "code": "SPN 4094",
      "slug": "spn-4094",
      "system": "SCR / DEF",
      "title": "NOx limits exceeded — derate",
      "severity": "RED",
      "derates": true,
      "part": "NOx sensor (outlet / tailpipe)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/code/spn-4094",
      "lang": "en"
    },
    {
      "code": "SPN 4364",
      "slug": "spn-4364",
      "system": "SCR / DEF",
      "title": "SCR conversion efficiency",
      "severity": "YELLOW",
      "derates": true,
      "part": "SCR catalyst",
      "price_low_usd": 1500,
      "price_high_usd": 6000,
      "source": "base_library",
      "url": "https://derate.app/code/spn-4364",
      "lang": "en"
    },
    {
      "code": "SPN 5246 FMI 0",
      "slug": "spn-5246-fmi-0",
      "system": "SCR / DEF",
      "title": "DEF inducement",
      "severity": "RED",
      "derates": true,
      "part": "Forced regeneration (shop)",
      "price_low_usd": 150,
      "price_high_usd": 500,
      "source": "reviewed_database",
      "url": "https://derate.app/code/spn-5246-fmi-0",
      "lang": "en"
    },
    {
      "code": "SPN 5394",
      "slug": "spn-5394",
      "system": "SCR / DEF",
      "title": "DEF dosing valve",
      "severity": "YELLOW",
      "derates": true,
      "part": "DEF dosing valve / injector",
      "price_low_usd": 250,
      "price_high_usd": 900,
      "source": "base_library",
      "url": "https://derate.app/code/spn-5394",
      "lang": "en"
    },
    {
      "code": "SPN 5571",
      "slug": "spn-5571",
      "system": "SCR / DEF",
      "title": "DEF high pressure relief",
      "severity": "YELLOW",
      "derates": false,
      "part": "DEF pressure line / relief valve",
      "price_low_usd": 120,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/code/spn-5571",
      "lang": "en"
    },
    {
      "code": "SPN 560",
      "slug": "spn-560",
      "system": "Transmission",
      "title": "Transmission driveline engaged",
      "severity": "YELLOW",
      "derates": false,
      "part": "Transmission harness / connector",
      "price_low_usd": 80,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/code/spn-560",
      "lang": "en"
    },
    {
      "code": "P0299",
      "slug": "p0299",
      "system": "Admisión / Turbo",
      "title": "Turbo con poca presión",
      "severity": "YELLOW",
      "derates": true,
      "part": "Actuador del turbo (VGT)",
      "price_low_usd": 600,
      "price_high_usd": 2200,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/p0299",
      "lang": "es"
    },
    {
      "code": "SPN 102 FMI 18",
      "slug": "spn-102-fmi-18",
      "system": "Admisión / Turbo",
      "title": "Presión del turbo",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor de presión de turbo (boost)",
      "price_low_usd": 60,
      "price_high_usd": 260,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-102-fmi-18",
      "lang": "es"
    },
    {
      "code": "SPN 105",
      "slug": "spn-105",
      "system": "Admisión / Turbo",
      "title": "Temperatura del múltiple de admisión",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de temperatura del múltiple de admisión",
      "price_low_usd": 40,
      "price_high_usd": 180,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-105",
      "lang": "es"
    },
    {
      "code": "SPN 641",
      "slug": "spn-641",
      "system": "Admisión / Turbo",
      "title": "Actuador del turbo (VGT)",
      "severity": "YELLOW",
      "derates": true,
      "part": "Actuador del turbo (VGT)",
      "price_low_usd": 600,
      "price_high_usd": 2200,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-641",
      "lang": "es"
    },
    {
      "code": "SPN 171",
      "slug": "spn-171",
      "system": "Ambiente",
      "title": "Temperatura del aire ambiente",
      "severity": "WHITE",
      "derates": false,
      "part": "Sensor de temperatura ambiente",
      "price_low_usd": 25,
      "price_high_usd": 120,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-171",
      "lang": "es"
    },
    {
      "code": "SPN 441",
      "slug": "spn-441",
      "system": "Auxiliar",
      "title": "Temperatura auxiliar",
      "severity": "WHITE",
      "derates": false,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-441",
      "lang": "es"
    },
    {
      "code": "SPN 84",
      "slug": "spn-84",
      "system": "Chasis",
      "title": "Velocidad del vehículo por ruedas",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de velocidad de rueda",
      "price_low_usd": 40,
      "price_high_usd": 180,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-84",
      "lang": "es"
    },
    {
      "code": "P0088",
      "slug": "p0088",
      "system": "Combustible",
      "title": "Presión del riel demasiado alta",
      "severity": "RED",
      "derates": true,
      "part": "Regulador / válvula de alivio de presión de combustible",
      "price_low_usd": 150,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/codigo/p0088",
      "lang": "es"
    },
    {
      "code": "SPN 94",
      "slug": "spn-94",
      "system": "Combustible",
      "title": "Presión de entrega de combustible",
      "severity": "YELLOW",
      "derates": true,
      "part": "Filtros de combustible (primario y secundario)",
      "price_low_usd": 40,
      "price_high_usd": 160,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-94",
      "lang": "es"
    },
    {
      "code": "SPN 97",
      "slug": "spn-97",
      "system": "Combustible",
      "title": "Agua en el combustible",
      "severity": "WHITE",
      "derates": false,
      "part": "Filtro separador de agua",
      "price_low_usd": 30,
      "price_high_usd": 120,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-97",
      "lang": "es"
    },
    {
      "code": "SPN 157",
      "slug": "spn-157",
      "system": "Combustible",
      "title": "Presión del riel de inyectores",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor de presión del riel de combustible",
      "price_low_usd": 120,
      "price_high_usd": 450,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-157",
      "lang": "es"
    },
    {
      "code": "SPN 651",
      "slug": "spn-651",
      "system": "Combustible",
      "title": "Inyector del cilindro 1",
      "severity": "YELLOW",
      "derates": false,
      "part": "Inyector (uno)",
      "price_low_usd": 350,
      "price_high_usd": 1200,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-651",
      "lang": "es"
    },
    {
      "code": "P0401",
      "slug": "p0401",
      "system": "EGR",
      "title": "Flujo de EGR insuficiente",
      "severity": "YELLOW",
      "derates": false,
      "part": "Válvula EGR",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/codigo/p0401",
      "lang": "es"
    },
    {
      "code": "SPN 27",
      "slug": "spn-27",
      "system": "EGR",
      "title": "Posición de la válvula EGR",
      "severity": "YELLOW",
      "derates": true,
      "part": "Válvula EGR",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-27",
      "lang": "es"
    },
    {
      "code": "SPN 411",
      "slug": "spn-411",
      "system": "EGR",
      "title": "Presión diferencial EGR",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor de presión diferencial EGR",
      "price_low_usd": 90,
      "price_high_usd": 320,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-411",
      "lang": "es"
    },
    {
      "code": "SPN 412",
      "slug": "spn-412",
      "system": "EGR",
      "title": "Temperatura EGR",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de temperatura EGR",
      "price_low_usd": 60,
      "price_high_usd": 220,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-412",
      "lang": "es"
    },
    {
      "code": "SPN 2791",
      "slug": "spn-2791",
      "system": "EGR",
      "title": "Control de la válvula EGR",
      "severity": "YELLOW",
      "derates": true,
      "part": "Válvula EGR",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-2791",
      "lang": "es"
    },
    {
      "code": "P0562",
      "slug": "p0562",
      "system": "Eléctrico / J1939",
      "title": "Voltaje del sistema bajo",
      "severity": "YELLOW",
      "derates": false,
      "part": "Alternador",
      "price_low_usd": 300,
      "price_high_usd": 1200,
      "source": "base_library",
      "url": "https://derate.app/codigo/p0562",
      "lang": "es"
    },
    {
      "code": "SPN 168",
      "slug": "spn-168",
      "system": "Eléctrico / J1939",
      "title": "Voltaje de batería / carga",
      "severity": "YELLOW",
      "derates": false,
      "part": "Alternador",
      "price_low_usd": 300,
      "price_high_usd": 1200,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-168",
      "lang": "es"
    },
    {
      "code": "SPN 620",
      "slug": "spn-620",
      "system": "Eléctrico / J1939",
      "title": "Alimentación de 5V a sensores",
      "severity": "YELLOW",
      "derates": false,
      "part": "Reparación de arnés / alimentación de sensores",
      "price_low_usd": 40,
      "price_high_usd": 400,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-620",
      "lang": "es"
    },
    {
      "code": "SPN 627",
      "slug": "spn-627",
      "system": "Eléctrico / J1939",
      "title": "Alimentación eléctrica de la ECU",
      "severity": "YELLOW",
      "derates": false,
      "part": "Reparación del circuito de alimentación del ECM",
      "price_low_usd": 40,
      "price_high_usd": 500,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-627",
      "lang": "es"
    },
    {
      "code": "SPN 639 FMI 2",
      "slug": "spn-639-fmi-2",
      "system": "Eléctrico / J1939",
      "title": "Bus de datos",
      "severity": "YELLOW",
      "derates": false,
      "part": "Reparación de la red J1939 (conector / resistencia terminal)",
      "price_low_usd": 20,
      "price_high_usd": 350,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-639-fmi-2",
      "lang": "es"
    },
    {
      "code": "SPN 1231",
      "slug": "spn-1231",
      "system": "Eléctrico / J1939",
      "title": "Red de datos J1939-1",
      "severity": "YELLOW",
      "derates": false,
      "part": "Reparación de la red J1939 (conector / resistencia terminal)",
      "price_low_usd": 20,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-1231",
      "lang": "es"
    },
    {
      "code": "SPN 2003",
      "slug": "spn-2003",
      "system": "Eléctrico / J1939",
      "title": "Red de datos de la transmisión",
      "severity": "YELLOW",
      "derates": false,
      "part": "Arnés / conector de transmisión",
      "price_low_usd": 80,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-2003",
      "lang": "es"
    },
    {
      "code": "P0128",
      "slug": "p0128",
      "system": "Enfriamiento",
      "title": "Termostato por debajo de la temperatura de trabajo",
      "severity": "WHITE",
      "derates": false,
      "part": "Termostato",
      "price_low_usd": 60,
      "price_high_usd": 320,
      "source": "base_library",
      "url": "https://derate.app/codigo/p0128",
      "lang": "es"
    },
    {
      "code": "SPN 110 FMI 0",
      "slug": "spn-110-fmi-0",
      "system": "Enfriamiento",
      "title": "Temperatura alta",
      "severity": "RED",
      "derates": true,
      "part": "Sensor de temperatura de refrigerante",
      "price_low_usd": 40,
      "price_high_usd": 180,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-110-fmi-0",
      "lang": "es"
    },
    {
      "code": "SPN 111",
      "slug": "spn-111",
      "system": "Enfriamiento",
      "title": "Nivel de refrigerante",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de nivel de refrigerante",
      "price_low_usd": 40,
      "price_high_usd": 200,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-111",
      "lang": "es"
    },
    {
      "code": "SPN 597",
      "slug": "spn-597",
      "system": "Frenos / ABS",
      "title": "Interruptor del freno",
      "severity": "RED",
      "derates": false,
      "part": "Interruptor del pedal de freno",
      "price_low_usd": 25,
      "price_high_usd": 140,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-597",
      "lang": "es"
    },
    {
      "code": "SPN 598",
      "slug": "spn-598",
      "system": "Frenos / ABS",
      "title": "Interruptor del clutch",
      "severity": "YELLOW",
      "derates": false,
      "part": "Interruptor del pedal de clutch",
      "price_low_usd": 25,
      "price_high_usd": 140,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-598",
      "lang": "es"
    },
    {
      "code": "SPN 789 FMI 7",
      "slug": "spn-789-fmi-7",
      "system": "Frenos / ABS",
      "title": "ABS del tráiler",
      "severity": "RED",
      "derates": null,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-789-fmi-7",
      "lang": "es"
    },
    {
      "code": "SPN 1067",
      "slug": "spn-1067",
      "system": "Frenos / ABS",
      "title": "Evento de ABS",
      "severity": "RED",
      "derates": false,
      "part": "Modulador / módulo ABS",
      "price_low_usd": 250,
      "price_high_usd": 1500,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-1067",
      "lang": "es"
    },
    {
      "code": "SPN 100 FMI 1",
      "slug": "spn-100-fmi-1",
      "system": "Lubricación",
      "title": "Presión de aceite",
      "severity": "RED",
      "derates": false,
      "part": "Sensor de presión de aceite",
      "price_low_usd": 50,
      "price_high_usd": 240,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-100-fmi-1",
      "lang": "es"
    },
    {
      "code": "SPN 51",
      "slug": "spn-51",
      "system": "Motor",
      "title": "Posición del acelerador (mariposa)",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de posición del acelerador",
      "price_low_usd": 80,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-51",
      "lang": "es"
    },
    {
      "code": "SPN 91",
      "slug": "spn-91",
      "system": "Motor",
      "title": "Posición del pedal del acelerador",
      "severity": "YELLOW",
      "derates": true,
      "part": "Pedal del acelerador (conjunto)",
      "price_low_usd": 180,
      "price_high_usd": 650,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-91",
      "lang": "es"
    },
    {
      "code": "SPN 98",
      "slug": "spn-98",
      "system": "Motor",
      "title": "Nivel de aceite del motor",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de nivel de aceite",
      "price_low_usd": 60,
      "price_high_usd": 260,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-98",
      "lang": "es"
    },
    {
      "code": "SPN 190",
      "slug": "spn-190",
      "system": "Motor",
      "title": "Velocidad del motor (RPM)",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de posición del cigüeñal",
      "price_low_usd": 60,
      "price_high_usd": 280,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-190",
      "lang": "es"
    },
    {
      "code": "SPN 512",
      "slug": "spn-512",
      "system": "Motor",
      "title": "Par solicitado por el chofer",
      "severity": "WHITE",
      "derates": false,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-512",
      "lang": "es"
    },
    {
      "code": "SPN 1569 FMI 31",
      "slug": "spn-1569-fmi-31",
      "system": "Motor",
      "title": "Derate de par",
      "severity": "RED",
      "derates": true,
      "part": null,
      "price_low_usd": null,
      "price_high_usd": null,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-1569-fmi-31",
      "lang": "es"
    },
    {
      "code": "P2002",
      "slug": "p2002",
      "system": "Postratamiento / DPF",
      "title": "Eficiencia del filtro DPF bajo el límite",
      "severity": "YELLOW",
      "derates": true,
      "part": "Limpieza del DPF (o filtro nuevo si está dañado)",
      "price_low_usd": 400,
      "price_high_usd": 4500,
      "source": "base_library",
      "url": "https://derate.app/codigo/p2002",
      "lang": "es"
    },
    {
      "code": "SPN 3242",
      "slug": "spn-3242",
      "system": "Postratamiento / DPF",
      "title": "Temperatura de entrada del filtro DPF",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de temperatura del DPF",
      "price_low_usd": 90,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3242",
      "lang": "es"
    },
    {
      "code": "SPN 3246",
      "slug": "spn-3246",
      "system": "Postratamiento / DPF",
      "title": "Temperatura de salida del filtro DPF",
      "severity": "YELLOW",
      "derates": false,
      "part": "Sensor de temperatura del DPF",
      "price_low_usd": 90,
      "price_high_usd": 350,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3246",
      "lang": "es"
    },
    {
      "code": "SPN 3251 FMI 0",
      "slug": "spn-3251-fmi-0",
      "system": "Postratamiento / DPF",
      "title": "Filtro de partículas",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor de presión diferencial del DPF",
      "price_low_usd": 180,
      "price_high_usd": 420,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-3251-fmi-0",
      "lang": "es"
    },
    {
      "code": "SPN 3719",
      "slug": "spn-3719",
      "system": "Postratamiento / DPF",
      "title": "Carga de hollín del filtro DPF",
      "severity": "YELLOW",
      "derates": true,
      "part": "Limpieza del DPF (o filtro nuevo si está dañado)",
      "price_low_usd": 400,
      "price_high_usd": 4500,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3719",
      "lang": "es"
    },
    {
      "code": "P20EE",
      "slug": "p20ee",
      "system": "SCR / DEF",
      "title": "Eficiencia del SCR bajo el límite",
      "severity": "YELLOW",
      "derates": true,
      "part": "Catalizador SCR",
      "price_low_usd": 1500,
      "price_high_usd": 6000,
      "source": "base_library",
      "url": "https://derate.app/codigo/p20ee",
      "lang": "es"
    },
    {
      "code": "SPN 3055",
      "slug": "spn-3055",
      "system": "SCR / DEF",
      "title": "NOx de entrada del postratamiento",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor NOx de entrada (salida de motor)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3055",
      "lang": "es"
    },
    {
      "code": "SPN 3216",
      "slug": "spn-3216",
      "system": "SCR / DEF",
      "title": "Sensor NOx de entrada del SCR",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor NOx de entrada (salida de motor)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3216",
      "lang": "es"
    },
    {
      "code": "SPN 3226",
      "slug": "spn-3226",
      "system": "SCR / DEF",
      "title": "Sensor NOx de salida del SCR",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor NOx de salida (escape)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3226",
      "lang": "es"
    },
    {
      "code": "SPN 3361",
      "slug": "spn-3361",
      "system": "SCR / DEF",
      "title": "Unidad dosificadora de DEF",
      "severity": "YELLOW",
      "derates": true,
      "part": "Módulo dosificador de DEF (bomba)",
      "price_low_usd": 700,
      "price_high_usd": 2800,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3361",
      "lang": "es"
    },
    {
      "code": "SPN 3364 FMI 18",
      "slug": "spn-3364-fmi-18",
      "system": "SCR / DEF",
      "title": "Calidad de DEF",
      "severity": "YELLOW",
      "derates": true,
      "part": "Vaciar y rellenar tanque de DEF (fluido contaminado)",
      "price_low_usd": 80,
      "price_high_usd": 350,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-3364-fmi-18",
      "lang": "es"
    },
    {
      "code": "SPN 3516",
      "slug": "spn-3516",
      "system": "SCR / DEF",
      "title": "Concentración del DEF",
      "severity": "YELLOW",
      "derates": true,
      "part": "Sensor de calidad / nivel de DEF (cabezal del tanque)",
      "price_low_usd": 350,
      "price_high_usd": 1400,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-3516",
      "lang": "es"
    },
    {
      "code": "SPN 4094",
      "slug": "spn-4094",
      "system": "SCR / DEF",
      "title": "Límites de NOx excedidos — derate",
      "severity": "RED",
      "derates": true,
      "part": "Sensor NOx de salida (escape)",
      "price_low_usd": 280,
      "price_high_usd": 800,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-4094",
      "lang": "es"
    },
    {
      "code": "SPN 4364",
      "slug": "spn-4364",
      "system": "SCR / DEF",
      "title": "Eficiencia de conversión del SCR",
      "severity": "YELLOW",
      "derates": true,
      "part": "Catalizador SCR",
      "price_low_usd": 1500,
      "price_high_usd": 6000,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-4364",
      "lang": "es"
    },
    {
      "code": "SPN 5246 FMI 0",
      "slug": "spn-5246-fmi-0",
      "system": "SCR / DEF",
      "title": "Inducción de DEF",
      "severity": "RED",
      "derates": true,
      "part": "Regeneración forzada (en taller)",
      "price_low_usd": 150,
      "price_high_usd": 500,
      "source": "reviewed_database",
      "url": "https://derate.app/codigo/spn-5246-fmi-0",
      "lang": "es"
    },
    {
      "code": "SPN 5394",
      "slug": "spn-5394",
      "system": "SCR / DEF",
      "title": "Válvula dosificadora de DEF",
      "severity": "YELLOW",
      "derates": true,
      "part": "Válvula dosificadora / inyector de DEF",
      "price_low_usd": 250,
      "price_high_usd": 900,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-5394",
      "lang": "es"
    },
    {
      "code": "SPN 5571",
      "slug": "spn-5571",
      "system": "SCR / DEF",
      "title": "Alivio de alta presión de DEF",
      "severity": "YELLOW",
      "derates": false,
      "part": "Línea de presión / válvula de alivio de DEF",
      "price_low_usd": 120,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-5571",
      "lang": "es"
    },
    {
      "code": "SPN 560",
      "slug": "spn-560",
      "system": "Transmisión",
      "title": "Tren motriz de la transmisión acoplado",
      "severity": "YELLOW",
      "derates": false,
      "part": "Arnés / conector de transmisión",
      "price_low_usd": 80,
      "price_high_usd": 600,
      "source": "base_library",
      "url": "https://derate.app/codigo/spn-560",
      "lang": "es"
    }
  ]
}