P0153moderate severityPowertrain
O2 Sensor Circuit Slow Response Bank 2 Sensor 1
on 2004-2006 Audi A8 4.2L V8 · AWD
What this code means
The upstream O2 sensor on Bank 2 is responding too slowly.
Symptoms
- Check Engine Light
- Poor fuel economy
- Failed emissions
Common causes
- Aging sensor
- Contaminated sensor
- Exhaust leak
Diagnostic steps
- Monitor switching rate
- Check for leaks
- Test response time
Repair notes
Replace O2 sensor.
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