OBD-II code guide
P0307 Cylinder 7 Misfire Detected
P0307 means the engine computer detected a misfire on cylinder 7.
What it means
Cylinder 7 is not burning the air-fuel mixture consistently.
Common symptoms
- Rough idle
- Engine shaking
- Poor acceleration
- Flashing check engine light
- Fuel smell
Likely causes
- Spark plug wear
- Ignition coil fault
- Injector issue
- Compression problem
- Wiring or connector issue
First checks
- Confirm the engine has a cylinder 7 and verify numbering.
- Check for related P0300 or fuel trim codes.
- Inspect ignition and injector connectors.
- Avoid driving hard with a flashing light.