P0064low severityPowertrain
HO2S Heater Control Circuit High (Bank 2 Sensor 3)
on 2014 Audi Q7 3.0L Supercharged V6 · AWD
What this code means
The heater circuit for bank 2 sensor 3 shows high voltage or an open circuit. Sensor heating is delayed, affecting readiness.
Symptoms
- Check engine light on
- Failed emissions readiness
- Slightly reduced fuel economy
Common causes
- Open heater circuit wiring
- Faulty O2 sensor heater
- Blown fuse
- Failed PCM driver
Diagnostic steps
- Scan and confirm code
- Check heater fuse and power supply
- Measure heater circuit for open
- Inspect connectors to sensor
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