P0043 OBD II Trouble Code HO2S Heater Control Circuit Low Bank 1 Sensor 3

Symptoms of P0043 OBD II Trouble Code

  • Malfunction indicator lamp (MIL) illumination
  • There will likely be no other symptoms

Common Causes of P0043 OBD II Trouble Code

  • Sensor #3 on bank 1 oxygen sensor heater element has failed
  • Physical damage to heated oxygen sensor has occurred
  • Control circuit (or voltage feed, depending on system) is shorted to ground
  • PCM Oxygen sensor heater driver has failed