P1102moderate severityPowertrain
HO2S Heater Resistance Bank 1 Sensor 1
on 2015 Audi A8 3.0L Supercharged V6 · AWD
What this code means
The ECU detected that the heater resistance in the upstream oxygen sensor on Bank 1 is outside the specified range. The heater brings the O2 sensor up to operating temperature quickly for accurate fuel trim control.
Symptoms
- Check Engine Light
- Poor cold-start fuel economy
- Extended warmup emissions
- Failed emissions test
Common causes
- Faulty O2 sensor heater element
- High-resistance connection in heater circuit
- Corroded O2 sensor connector
- Blown heater circuit fuse
Diagnostic steps
- Test O2 sensor heater resistance (should be 2-30 ohms)
- Check heater circuit fuse
- Inspect wiring and connector for corrosion
- Measure voltage at heater circuit
Repair notes
Replace the upstream O2 sensor on Bank 1 if heater resistance is out of specification.
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