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.
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.