P033D OBD II Trouble Code Knock Sensor 4 Circuit High (Bank 2)

Symptoms of P033D OBD II Trouble Code

  • MIL (Malfunction Indicator Lamp) illumination
  • Audible knocking from the engine compartment
  • Pinging from engine under acceleration

Common Causes of P033D OBD II Trouble Code

  • Knock sensor connector is damaged
  • Knock sensor circuit is open or shorted to ground
  • Knock sensor circuit is shorted to voltage
  • Knock sensor has failed
  • Moisture in knock sensor connectors
  • Incorrect fuel octane
  • PCM has failed

Severity of P033D OBD II Trouble Code

If the PCM determines that the knock is out of the ordinary or that the noise level is abnormally high for knock sensor #4 on bank 2, P033D may set. If the PCM senses that the knock is severe and cannot be eliminated by retarding the spark timing, P033D may set. Keep in mind that knock sensors cannot distinguish between a knock from pre-detonation or one from engine problems. Bank 2 is always the side of the engine that does not contain cylinder #1. Refer to a vehicle specific repair guide to determine the location of sensor #4 on your particular vehicle.