P0031 OBD II Trouble Code Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) - DTC Code

Detailed information on troubleshooting and repairing a p0031 automotive trouble code which refers to an oxygen sensor heater circuit that is low. Also includes links to relevant forum topics on the code.

Symptoms of P0031 OBD II Trouble Code

  • Most likely you'll not notice any symptoms other than the MIL (malfunction indicator lamp, a.k.a. the check engine light) will illuminate.

Common Causes of P0031 OBD II Trouble Code

  • A short or open in the heater circuit in the sensor
  • A failed O2 sensor heater
  • Wiring/connectors broken/frayed leading to sensor and/or relay
  • Failed PCM/ECM