What P0306 means
Cylinder 6 is misfiring. Same diagnostic approach as any single-cylinder misfire.
Common causes
- Coil or spark plug failure
- Injector fault
- Compression loss
How it is usually fixed
- 1Swap coil/plug with an adjacent cylinder to isolate
- 2Check injector
- 3Compression test
Other common codes
- P0011 — Camshaft Position A – Timing Over-Advanced (Bank 1)
- P0030 — HO2S Heater Control Circuit (Bank 1, Sensor 1)
- P0101 — Mass Air Flow Circuit Range/Performance
- P0113 — Intake Air Temperature Sensor Circuit High
- P0118 — Engine Coolant Temperature Sensor Circuit High
- P0131 — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
Code information is general guidance, not a diagnosis for a specific vehicle. Confirm with live data and manufacturer test procedures before replacing parts.