P0309 OBD II Trouble Code Cylinder 9 Nine Misfire Detected

Symptoms of P0309 OBD II Trouble Code

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present

Common Causes of P0309 OBD II Trouble Code

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer