What the light means
Your engine computer detected a fault in emissions, ignition, fuel or sensors. A solid light means get it checked soon; a flashing light means a misfire that can damage the catalytic converter.
Most common causes
In our experience the top causes are:
- Loose or bad gas cap
- Oxygen sensor failure
- Ignition coil or spark plug misfire
- EVAP leaks
- Mass airflow sensor issues
- Catalytic converter efficiency
Why a free code read isn't enough
A code tells you which system failed a test, not which part failed. Professional diagnostics test components so you only pay for the repair you need.
Texas inspection and the light
In Dallas-area counties, a lit check engine light fails the state emissions inspection. Fix it before your registration is due.
