P0306 OBD II Trouble Code Cylinder 6 Misfire Detected

Symptoms of P0306 OBD II Trouble Code

  • Diminished engine performance
  • Rough or unstable feeling from engine (at idle or under light acceleration)
  • Odd odor from engine exhaust
  • Flashing or constant MIL (malfunction indicator lamp) illumination

Common Causes of P0306 OBD II Trouble Code

  • Defective ignition coil(s)
  • Bad spark plug(s), spark plug wires, or spark plug boots
  • Faulty fuel injector(s)
  • Malfunctioning fuel delivery system (fuel pump, fuel pump relay, fuel injectors, or fuel filter)
  • Major engine vacuum leak
  • EGR valve stuck in the wide open position
  • Clogged EGR ports

Severity of P0306 OBD II Trouble Code

Conditions which promote storage of a P0306 are likely to cause catalytic converter and/or engine damage. This code should be classified as severe.