What Does Your Error Code Mean?

The catalytic converter isn't cleaning exhaust gases efficiently enough on the driver's side of the engine.

The engine is getting too much air or too little fuel on the driver's side.

One or more cylinders are misfiring randomly, meaning fuel isn't igniting correctly.

There's a significant leak in the fuel vapor containment system — most often just a loose or damaged gas cap.

There's a small leak in your car's fuel vapor system, often from a worn gas cap or a small crack in an EVAP hose.

There's a very small leak in the fuel vapor system — even smaller than a P0442.

The catalytic converter on the passenger side of the engine isn't working efficiently enough.

The EGR system isn't routing enough exhaust gas back into the engine as commanded.

Cylinder 1 isn't firing correctly — combustion isn't happening as it should in that specific cylinder.

Cylinder 2 isn't firing correctly — combustion is incomplete or absent in that specific cylinder.

Cylinder 3 is misfiring — that cylinder isn't completing combustion the way it should.

The heater element inside the upstream oxygen sensor on the driver's side isn't working properly.

The heater inside the downstream oxygen sensor (after the catalytic converter) on the driver's side isn't working.

The mass airflow sensor is sending readings to the ECU that are outside the expected range for current driving conditions.

The intake air temperature sensor is sending a voltage signal that's higher than what the ECU expects, suggesting a cold or open circuit.