Severity: Critical
Check Engine Light Flashing
A flashing check engine light usually means an active misfire that can damage the catalytic converter. Diagnose it before driving hard.
Most likely causes
- Active misfire
- Ignition coil or spark plug failure
- Injector fault
- Vacuum leak
- Low compression
First checks before replacing parts
- Stop heavy acceleration
- Scan for P0300-P0308
- Check misfire counters
- Inspect plugs, coils, injector connectors
- Verify fuel trim and vacuum leaks
Related systems
- Misfire
- Ignition
- Fuel delivery
- Catalyst protection