P0158moderate severityPowertrain
O2 Sensor Circuit High Voltage Bank 2 Sensor 2
on 2001 Audi A6 2.7L Turbo V6 · AWD
What this code means
High voltage from the downstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
- May indicate catalyst failure
Common causes
- Faulty sensor
- Catalyst failure
- Rich condition
Diagnostic steps
- Test voltage
- Check catalyst
Repair notes
Replace sensor or catalyst.
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P0002
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P0010
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P0014
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P0015
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