OBD2 code lookup
Type the code your scanner or auto parts store gave you. See what it means, the likely causes, whether you can keep driving and what the repair should cost. Free, no signup.
Most common codes
- P0420Catalyst System Efficiency Below Threshold (Bank 1)
- P0171System Too Lean (Bank 1)
- P0300Random/Multiple Cylinder Misfire Detected
- P0401Exhaust Gas Recirculation Flow Insufficient Detected
- P0174System Too Lean (Bank 2)
- P0442Evaporative Emission System Leak Detected (Small Leak)
- P0455Evaporative Emission System Leak Detected (Large Leak)
- P0440Evaporative Emission System
- P0141O2 Sensor Heater Circuit (Bank 1 Sensor 2)
- P0430Catalyst System Efficiency Below Threshold (Bank 2)
- P0135O2 Sensor Heater Circuit (Bank 1 Sensor 1)
- P0446Evaporative Emission System Vent Control Circuit
- P0128Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
- P0301Cylinder 1 Misfire Detected
- P0411Secondary Air Injection System Incorrect Flow Detected
- P0133O2 Sensor Circuit Slow OBDResponse (Bank 1 Sensor 1)
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All codes by system
Emissions
- P0135O2 Sensor Heater Circuit (Bank 1 Sensor 1)
- P0141O2 Sensor Heater Circuit (Bank 1 Sensor 2)
- P0401Exhaust Gas Recirculation Flow Insufficient Detected
- P0411Secondary Air Injection System Incorrect Flow Detected
- P0420Catalyst System Efficiency Below Threshold (Bank 1)
- P0430Catalyst System Efficiency Below Threshold (Bank 2)
- P0440Evaporative Emission System
- P0442Evaporative Emission System Leak Detected (Small Leak)
- P0446Evaporative Emission System Vent Control Circuit
- P0455Evaporative Emission System Leak Detected (Large Leak)
Engine
Fuel and air
Cooling
- P0128Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)