Meaning
What It Means
The check engine light means the vehicle detected an emissions, fuel, ignition, or sensor fault.
Warning light guide
Check Engine Light Meaning & Repair Cost
The check engine light means the vehicle detected an emissions, fuel, ignition, or sensor fault.
Severity: Variable Common causes Related repair costs
Can I keep driving?
Safety Guidance
If the car feels unstable, overheats, loses power, or the light appears with severe symptoms, stop driving and get help.
Common causes
Possible Causes
Warning lights need diagnosis before parts replacement.
Loose gas cap
Ask the shop to confirm this cause before replacing parts.
Misfire
Ask the shop to confirm this cause before replacing parts.
Oxygen sensor
Ask the shop to confirm this cause before replacing parts.
Catalytic converter
Ask the shop to confirm this cause before replacing parts.
Vacuum leak
Ask the shop to confirm this cause before replacing parts.
Related repairs
Estimated Repair Costs
Compare likely repair pages before approving a quote.
FAQ
Check Engine Light questions
The check engine light means the vehicle detected an emissions, fuel, ignition, or sensor fault.
Severity is usually variable, but symptoms and drivability matter. A mechanic can confirm the risk.
If the vehicle loses power, brakes poorly, overheats, or feels unstable, avoid driving and get inspection quickly.
The broad planning range for related diagnosis and repair is $90-$2,900.
Start with the related repair pages below, then compare diagnostic fee, parts brand, labor hours, and warranty.