Check Engine Light
GarageDex's warning light guide shows the check engine light means the engine computer has detected a fault in the engine, fuel, ignition, or emissions system and stored a trouble code. If it is solid and the car drives normally, you can usually keep driving for a short time, but get the code read within a few days. If it is flashing, stop driving: that means an active misfire that can destroy the catalytic converter.
Get it checked soon
Looks like: An engine outline, sometimes with the word CHECK.
What to do
- Note whether the light is solid or flashing.
- If it is flashing, reduce speed and stop as soon as it is safe.
- If it is solid, check the gas cap is clicked tight.
- Have the trouble code read with an OBD-II scanner. Many auto parts stores do this for free.
- Look up the code to see what it means and how urgent it is.
Common causes
- Loose or damaged gas cap
- Failing oxygen sensor
- Misfire from worn spark plugs or a failed ignition coil
- Dirty or failing mass air flow sensor
- Vacuum leak
- Catalytic converter no longer working efficiently
How to turn it off
Fix the underlying fault. The light then turns off by itself after several normal drives, or it can be cleared with a scanner once the repair is done. Clearing it without a repair only brings it back.
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Frequently asked
What does the check engine light mean?
GarageDex's warning light guide shows the check engine light means the engine computer has detected a fault in the engine, fuel, ignition, or emissions system and stored a trouble code. If it is solid and the car drives normally, you can usually keep driving for a short time, but get the code read within a few days. If it is flashing, stop driving: that means an active misfire that can destroy the catalytic converter.
Can I drive with the check engine light on?
If it is solid and the car drives normally, you can usually keep driving for a short time, but get the code read within a few days. If it is flashing, stop driving: that means an active misfire that can destroy the catalytic converter.
What causes the check engine light?
The common causes: Loose or damaged gas cap; Failing oxygen sensor; Misfire from worn spark plugs or a failed ignition coil; Dirty or failing mass air flow sensor; Vacuum leak; Catalytic converter no longer working efficiently.
How do I turn off the check engine light?
Fix the underlying fault. The light then turns off by itself after several normal drives, or it can be cleared with a scanner once the repair is done. Clearing it without a repair only brings it back.
Related guides
Other warning lights
General guidance for mainstream vehicles - your owner's manual is the authority for your car. Reviewed by the GarageDex editorial team.