Check engine light on (yellow) or blinking
The engine icon on the dash — what it means and whether you can keep driving.
Solid yellow — ECU detected a fault that doesn't require immediate shutdown. You can drive to the shop, but don't ignore it. Pull the codes first.
Blinking yellow — active misfire that destroys the catalyst. Reduce load (ease off the throttle), drive to the shop by the shortest route. Every 6 miles with a blinking CEL costs you the equivalent of a new catalytic converter ($500-1500).
Red (rare, depends on car) — critical fault (oil pressure, temp). Stop immediately.
First diagnostic steps
- Don't panic — pull the codes with a scanner
- Record or photograph the code + freeze frame
- With blinking CEL — no full throttle
- Do NOT clear the code until root cause is known
- Check oil and coolant levels before driving to the shop
Likely fault codes
Click a code for detailed description, causes, and diagnostic plan.