Check Engine Light On

The check engine light is on and you don't know why. It can signal anything from a loose gas cap to a misfire — a quick diagnostic scan pinpoints the exact cause.

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Common causes

Loose or damaged gas cap
Engine misfire from worn plugs or coils
Faulty oxygen or MAF sensor
Catalytic converter efficiency issues
EVAP emissions leak
Failing engine or transmission sensor

Frequently asked questions

Is it safe to drive with the check engine light on?

If the light is steady and the car drives normally, it's usually okay to drive to a shop. A flashing light means stop soon to avoid serious damage.

What's the difference between a steady and flashing light?

A steady light is a non-urgent fault to check soon; a flashing light signals an active misfire that can damage the catalytic converter.

How it works

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