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