Check Engine Light Flashing — Is It an Emergency?
A steady check engine light means a fault to inspect soon, but a flashing one means an active, serious fault (usually a misfire) that can damage the catalytic converter within minutes.
Steady vs flashing
Steady: inspect soon, driving is usually safe short-term. Flashing: immediate danger — a misfire dumps unburnt fuel into the converter and overheats it to failure.
What to do when flashing
Slow down, avoid acceleration and loads, and head to the nearest safe spot or shop. Reducing load reduces damage.
After stopping
Read the code via OBD2 (often P0300/P030X misfire). Mowtar AI explains the code and ranks the cause — plugs/coil/injector.
FAQ
It stopped flashing and is steady now — danger over?
The active danger eased but the cause remains — inspect soon before the flashing returns.
Can I drive a short distance?
With flashing: as little as possible and at the lightest load. Every minute of misfire raises converter-damage risk.