Engine and gearbox (P)
P0306: Cylinder 6 misfire detected
The engine control unit has detected a misfire in cylinder 6. This can affect engine performance and emissions.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Rough idle
- Loss of power
- Increased fuel consumption
- Engine hesitation
- Check engine light on
Common causes
- Faulty spark plug
- Failed ignition coil
- Clogged or faulty fuel injector
- Vacuum leak
- Engine mechanical issue
How to check it yourself
- Inspect and replace spark plug
- Swap ignition coil with another cylinder
- Check fuel injector operation
- Inspect for vacuum leaks
- Perform a compression test
Can I keep driving?
The car can be driven, but prolonged driving may cause further damage.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer