misfire error P0306

Question

error code- 0306
Hyundai Azzera 2008
sometimes when car starts , check alarm is flashing (on/off) and car moves hardly and engine starts shaking . Then when we turn off the engine and again starts, mostly problem would be solved . but again in next starts it will happen again usually . Coil 6 and spark 6 is already replaced but Problem not solved .

Answer 1

if there are no intake leaks. the problem might be a bad injector, or harness issue (on coil or injector)

Other possible causes:
- Clogged or faulty fuel injector 6
- Fuel injector 6 harness is open or shorted
- Fuel injector 6 circuit poor electrical connection
- Ignition coil 6 harness is open or shorted
- Ignition coil 6 circuit poor electrical connection
- Insufficient cylinder 6 compression
- Incorrect fuel pressure
- Intake air leak