P0037 OBD II Trouble Code HO2S Heater Control Circuit Low (Bank 1 Sensor 2)

Detailed information on troubleshooting and repairing a P0037 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 P0037 OBD II Trouble Code

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

Common Causes of P0037 OBD II Trouble Code

  • Bank 1, sensor #2 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