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P0130 – O2 Sensor Circuit (Bank 1 Sensor 1)
Symptoms
- Unstable idle
- Increased fuel consumption
- Reduced engine power
- Check engine light on
Causes
- Faulty oxygen sensor
- Damaged wiring or poor connections
- Exhaust leak before the sensor
- Incorrect air‑fuel mixture
Diagnosis
- Read O2 sensor voltage and fuel trims
- Inspect wiring and connectors
- Check for exhaust leaks at the manifold
- Compare sensor readings to specifications
Repair
- Replace the oxygen sensor
- Repair wiring or connectors
- Fix exhaust leaks
- Clear fault codes and test drive
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