Warning light guide
The check engine light means the vehicle detected an emissions, fuel, ignition, or sensor fault.
Meaning
The check engine light means the vehicle detected an emissions, fuel, ignition, or sensor fault.
A steady light can often wait for scheduled diagnosis, but a flashing check engine light means active misfire risk and should be treated as urgent.
Can I keep driving?
If the car feels unstable, overheats, loses power, or the light appears with severe symptoms, stop driving and get help.
A steady light usually means the car has stored a fault. A flashing light can indicate active misfire that may damage the catalytic converter.
A free code scan reads stored codes. Professional diagnosis tests the root cause before parts are replaced.
Compare check engine light diagnostic costP0420, P0300, and P0171 are common examples, but the code is only a clue. Symptoms and test results decide the repair path.
Open OBD code guideCommon causes
Warning lights need diagnosis before parts replacement.
Ask the shop to confirm this cause before replacing parts.
Ask the shop to confirm this cause before replacing parts.
Ask the shop to confirm this cause before replacing parts.
Ask the shop to confirm this cause before replacing parts.
Ask the shop to confirm this cause before replacing parts.
Related repairs
Compare likely repair pages before approving a quote.
FAQ
