Free tool

Check engine light code lookup

Type the code your scanner gave you. These are generic OBD-II codes, which means they are standardized across every make and model sold in the US since 1996 — a P0420 means the same thing on a Honda as on a Ford. What differs is where the part lives and which one your engine takes, and that is what your VIN is for.

Search trouble codes

57 codes

C0035Left Front Wheel Speed Sensor CircuitHigh C0040Right Front Wheel Speed Sensor CircuitHigh C0045Left Rear Wheel Speed Sensor CircuitHigh C0050Right Rear Wheel Speed Sensor CircuitHigh P0011Camshaft Position A - Timing Over-Advanced (Bank 1)Moderate P0016Crankshaft / Camshaft Position Correlation (Bank 1 Sensor A)High P0087Fuel Rail / System Pressure Too LowHigh P0101Mass Air Flow Circuit Range / PerformanceModerate P0102Mass Air Flow Circuit Low InputModerate P0106MAP / Barometric Pressure Circuit Range / PerformanceModerate P0113Intake Air Temperature Sensor Circuit High InputLow P0117Engine Coolant Temperature Circuit Low InputModerate P0121Throttle Position Sensor Circuit Range / PerformanceModerate P0128Coolant Thermostat Below Regulating TemperatureModerate P0131O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)Moderate P0134O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)Moderate P0135O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)Moderate P0141O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)Moderate P0171System Too Lean (Bank 1)Moderate P0172System Too Rich (Bank 1)Moderate P0174System Too Lean (Bank 2)Moderate P0175System Too Rich (Bank 2)Moderate P0299Turbocharger / Supercharger UnderboostHigh P0300Random / Multiple Cylinder Misfire DetectedHigh P0301Cylinder 1 Misfire DetectedHigh P0302Cylinder 2 Misfire DetectedHigh P0303Cylinder 3 Misfire DetectedHigh P0304Cylinder 4 Misfire DetectedHigh P0305Cylinder 5 Misfire DetectedHigh P0306Cylinder 6 Misfire DetectedHigh P0316Misfire Detected on Startup (First 1000 Revolutions)High P0325Knock Sensor 1 Circuit Malfunction (Bank 1)Moderate P0335Crankshaft Position Sensor A Circuit MalfunctionHigh P0340Camshaft Position Sensor A Circuit MalfunctionHigh P0401Exhaust Gas Recirculation Flow InsufficientModerate P0403Exhaust Gas Recirculation Control CircuitModerate P0411Secondary Air Injection System Incorrect FlowModerate P0420Catalyst System Efficiency Below Threshold (Bank 1)Moderate P0430Catalyst System Efficiency Below Threshold (Bank 2)Moderate P0441Evaporative Emission Control System Incorrect Purge FlowLow P0442Evaporative Emission System Leak Detected (Small Leak)Low P0446Evaporative Emission Control System Vent Control CircuitLow P0449Evaporative Emission System Vent Valve / Solenoid CircuitLow P0455Evaporative Emission System Leak Detected (Large Leak)Low P0456Evaporative Emission System Leak Detected (Very Small Leak)Low P0500Vehicle Speed Sensor A MalfunctionModerate P0505Idle Air Control System MalfunctionModerate P0521Engine Oil Pressure Sensor / Switch Range / PerformanceHigh P0562System Voltage LowModerate P0603Internal Control Module Keep Alive Memory ErrorModerate P0685ECM/PCM Power Relay Control Circuit OpenModerate P0700Transmission Control System MalfunctionHigh P2096Post Catalyst Fuel Trim System Too Lean (Bank 1)Moderate P2195O2 Sensor Signal Stuck Lean (Bank 1 Sensor 1)Moderate P2270O2 Sensor Signal Stuck Lean (Bank 1 Sensor 2)Moderate U0100Lost Communication With ECM/PCM AHigh U0121Lost Communication With ABS Control ModuleHigh

Manufacturer-specific codes beginning P1, P2 above 2999, B1, C1 or U1 are proprietary to each automaker and are not part of the OBD-II standard. We only publish codes we can state accurately, so those are not listed here rather than guessed at.