OBD-II code guide
P0305 Cylinder 5 Misfire Detected
P0305 means the engine computer detected a misfire on cylinder 5.
What it means
Cylinder 5 is not contributing smoothly because combustion is incomplete or irregular.
Common symptoms
- Shaking
- Rough idle
- Flashing check engine light
- Poor acceleration
- Fuel smell
Likely causes
- Spark plug or coil problem
- Injector issue
- Compression problem
- Vacuum leak near cylinder
- Wiring fault
First checks
- Avoid driving with a flashing light.
- Compare coil, plug, injector, and compression data.
- Check for fuel or coolant intrusion signs.
- Use cylinder-specific testing instead of guessing.