The check engine light can mean anything from a loose gas cap to a serious misfire. The light itself does not tell you how urgent the problem is — but how it behaves does.
Steady light vs. flashing light
- Steady: a fault has been stored. Book a diagnostic soon, but it is usually safe to keep driving.
- Flashing: the engine is misfiring badly enough to damage the catalytic converter. Reduce speed and get the car checked as soon as possible.
The most common causes
- A loose or damaged gas cap
- Faulty oxygen or mass airflow sensor
- Worn spark plugs or ignition coils
- Vacuum leaks
- A failing catalytic converter
Why a code is not a diagnosis
A free code reading at a parts store tells you which system reported the fault, not which part has failed. A code for a lean mixture, for example, can be caused by a vacuum leak, a weak fuel pump or a dirty sensor. Replacing parts by guesswork gets expensive quickly.
Our engine diagnostics service uses live data and hands-on testing to find the real cause, and the fee is credited toward the repair. Book a diagnostic or ask a service advisor.
