P0157moderate severityPowertrain
O2 Sensor Circuit Low Voltage Bank 2 Sensor 2
on 2002 BMW 540iT E39 4.4L V8 M62 Touring · RWD
What this code means
Low voltage from the downstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
Common causes
- Faulty sensor
- Short to ground
- Exhaust leak
Diagnostic steps
- Test voltage
- Check for shorts
Repair notes
Replace sensor.
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