What a flash means
The engine computer flashes the light when misfires are severe enough to damage the catalytic converter — an expensive part, often $1,000–$2,500.
Common causes
Failed ignition coils, worn spark plugs, a clogged fuel injector, or a vacuum leak. Codes P0300–P0308 identify which cylinder.
What to do
Pull over safely, turn off the engine, and call a mobile mechanic. A misfire diagnosis and coil or plug replacement can usually be done where the car sits.
Frequently asked questions
Steady vs flashing?
Steady: get it checked soon. Flashing: stop driving.
Will it pass Texas inspection?
No — an illuminated check engine light fails the emissions test in emissions counties.
Can bad gas cause it?
Rarely. Ignition problems are far more common.
Related services
- Mobile check engine light diagnostics — Professional scan-tool diagnosis at your location.
- Mobile spark plug & ignition coil replacement — Misfire repair, spark plugs, coils, and plug wires.
Need a mobile mechanic near you?
Our mobile mechanics can come to you today. Call 469-813-8778.
