P0063: HO2S Heater Control Circuit Low Bank 2 Sensor 3 — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
HO2S Heater Control Circuit Low Bank 2 Sensor 3. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- Check Engine Light illumination
- Decreased fuel efficiency
- Increased tailpipe emissions
- Failed emissions inspection
Possible causes
- Faulty oxygen sensor heater circuit
- Blown fuse for the O2 sensor heater
- Damaged or corroded sensor wiring
- Short circuit in the sensor heater wiring
- Open circuit in the sensor heater element
What to check
- Inspect the oxygen sensor connector and wiring for physical damage or corrosion
- Verify the integrity of the fuse dedicated to the oxygen sensor heater circuit
- Measure the resistance of the oxygen sensor heater element using a multimeter
- Test for battery voltage at the sensor connector with the ignition switched to ON
- Check for continuity between the sensor connector and the engine control module
Also written as: P0063-00, P006300, PO063 (some scan tools add the fault-type byte, e.g. -00).