P0036 OBD II Trouble Code HO2S Heater Control Circuit (Bank 1 Sensor 2)

Detailed information on troubleshooting and repairing a P0036 DTC code which refers to a problem in the HO2S heater control circuit. Also includes links to relevant forum topics on the code.

Symptoms of P0036 OBD II Trouble Code

    Symptoms of a P0036 DTC includes MIL (Malfunction indicator lamp) illumination. You will probably not notice anyother symptoms associated with the failure of the heated circuit since it only runs momentarily when the vehicle is first started. This sensor is also after the catalytic converter, so it will not affect the air/fuel ratio input to the PCM/ECM; it is primarily used to verify the catalytic converters efficiency.

Common Causes of P0036 OBD II Trouble Code

  • Open circuit inside oxygen sensor or open power or ground wires to oxygen sensor
  • Exhaust system ground strap may have become corroded or broken
  • PCM/ECM or oxygen sensor heater circuit wiring has failed