Check engine light on? Fix it or park it?
Type your OBD-II code for a plain-English answer: is it safe to drive, what usually causes it, and what the repair may cost.
Light flashing?
A flashing check engine light usually means a serious misfire. Pull over when safe. Learn why.
How we rate codes
- OK TO DRIVE (fix soon)
- DRIVE WITH CAUTION
- PARK IT
- STOP: do not drive
We lean conservative on safety. Every code page shows the cost math behind its estimate.
Popular codes
- P0420Catalyst System Efficiency Below Threshold (Bank 1)
- P0430Catalyst System Efficiency Below Threshold (Bank 2)
- P0300Random or Multiple Cylinder Misfire Detected
- P0301Cylinder 1 Misfire Detected
- P0302Cylinder 2 Misfire Detected
- P0303Cylinder 3 Misfire Detected
- P0304Cylinder 4 Misfire Detected
- P0171System Too Lean (Bank 1)
- P0174System Too Lean (Bank 2)
- P0440Evaporative Emission System Malfunction
- P0442Evaporative Emission System Small Leak Detected
- P0455Evaporative Emission System Large Leak Detected
- P0456Evaporative Emission System Very Small Leak Detected
- P0128Coolant Thermostat (Coolant Temperature Below Regulating Temperature)
- P0135O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
- P0141O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
- P0101Mass Air Flow (MAF) Sensor Circuit Range/Performance
- P0299Turbocharger or Supercharger Underboost
- P2135Throttle/Pedal Position Sensor Voltage Correlation
- P0401Exhaust Gas Recirculation (EGR) Flow Insufficient