P0056low severityPowertrain
HO2S Heater Control Circuit Bank 2 Sensor 2
on 2021 Audi A3 2.0L Turbo I4 · AWD
What this code means
Malfunction in the heater circuit for the downstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
- Failed emissions
- Poor catalyst monitoring
Common causes
- Faulty sensor heater
- Blown fuse
- Wiring issue
Diagnostic steps
- Check fuse
- Test heater resistance
- Inspect wiring
Repair notes
Replace O2 sensor or repair wiring.
Other Powertrain codes on this vehicle
P0001
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P0002
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P0004
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P0010
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P0014
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P0015
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