Flashing check engine light
The check engine light blinking on and off while you drive.
STOP / DO NOT DRIVE
Do not keep driving it · Amber means get it checked
Flashing is different from steady
A steady check engine light means the computer has stored a fault to be diagnosed. A flashing one means a fault is happening right now — most often an active misfire, where a cylinder is dumping unburned fuel into the exhaust. That raw fuel can overheat and destroy the catalytic converter in a surprisingly short time, turning a modest repair into an expensive one.
Can I drive?
Treat it as a get-off-the-throttle situation. If it is flashing and the car is shaking, losing power, or running badly, do not keep driving — that combination is the shared high-risk signal our Can I Drive It? tool flags as stop. If it flashes briefly and goes steady, it still needs prompt diagnosis.
Common causes
A misfire from ignition (plugs, coils), fuel delivery, a vacuum leak, or a sensor fault. The light narrows it to a misfire; it does not name the part.
Do you have a trouble code?
If you or a parts store have read a code (like P0301), look it up to see what system it points to. A code narrows things down — it does not, on its own, prove which part has failed.
Warning-light symbols and meanings vary by vehicle — always check your owner’s manual. This is general guidance based on what the light indicates, not a physical inspection, and a light on its own never names a failed part.
Related Driver Help
Related warning lights
Want to know what is causing the warning?
Auto Star can read the codes, inspect the vehicle, and find the underlying cause before recommending any repairs — you see what we find and approve the work first.