P2197 – O2 Sensor Signal Biased/Stuck Lean (Bank 2 Sensor 1)
Description
The upstream oxygen sensor on Bank 2 is stuck indicating a lean condition. This affects fuel trim and can cause hesitation and rough idle.
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View Recommended ScannersSymptoms
- Rough idle
- Hesitation
- Poor acceleration
- High fuel trims
- Check engine light
Causes
- Faulty O2 sensor
- Exhaust leak
- Wiring damage
- Contaminated sensor
Diagnosis
- Check O2 sensor voltage
- Inspect wiring
- Check for exhaust leaks
- Monitor fuel trims
Repair
- Replace O2 sensor
- Repair wiring
- Fix exhaust leaks
