OBD codes / P0301
P0301
SeriousCylinder 1 Misfire Detected
Address promptly — can worsen or affect drivability.
Likely causes
- bad plug/coil cyl 1
- injector
- low compression
Common fixes
- swap coil to confirm
- replace plug
- check injector
Seeing P0301 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0301 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.