P0167: Concerns the heater circuit of the oxygen sensor at bank 2, sensor 3.
Meaning, symptoms, causes and checks
Concerns the heater circuit of the oxygen sensor at bank 2, sensor 3. The definition identifies the heater function rather than the sensor's mixture-response signal.
Affected system: Powertrain
Symptoms
- Check Engine light illuminated
- Increased fuel consumption
- Engine running in rich or lean condition
- Failed emissions test
Possible causes
- Defective oxygen sensor heater element
- Corroded or damaged oxygen sensor wiring
- Blown fuse for the O2 sensor heater circuit
- Faulty engine control module (ECM/PCM)
- Poor electrical connection at the sensor connector
What to check
- Inspect the oxygen sensor wiring harness and connector for signs of melting or corrosion
- Verify the integrity of the O2 sensor heater fuse in the power distribution box
- Measure the resistance across the heater terminals of the sensor using a multimeter
- Test for battery voltage at the sensor connector with the ignition in the ON position
- Check for continuity between the sensor connector and the engine control module
Also written as: P0167-00, P016700, PO167 (some scan tools add the fault-type byte, e.g. -00).