Symptom guides

Car symptoms, explained

What a warning light or a strange feeling from the car means, what to do right now, and what an OBD2 scanner shows. For a code you already have, see the trouble code library.

Check engine light flashing Why it flashes, what to do in the next ten minutes, and what the misfire counts show. Slow down now. Stop driving soon.

Codes and live sensors are free in the app

Read it on your own car

ScanMyCar reads your car's codes, with stored, pending and permanent codes from every module, the freeze frame and 139 live sensors, and explains them in plain words. Trouble codes and live sensors are free. Obie, the AI mechanic, is part of ScanMyCar Pro.

Preorder the OBD-II scanner Download on theApp Store

The ScanMyCar OBD-II scanner: $34.99, regular price $49. Free shipping in the US. Terms

Works with the ScanMyCar OBD-II scanner or any Bluetooth OBD-II adapter. Sign in with your email.