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

P0000 OBD II Trouble Code No Diagnostic Trouble Codes Found

P0001 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit/Open

P0002 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0003 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0004 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0005 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit/Open

P0006 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit Low

P0007 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit High

P0008 OBD II Trouble Code Engine Positions System Performance Bank 1

P0009 OBD II Trouble Code Engine Positions System Performance Bank 2