P0130
O2 sensor circuit (Bank 1 Sensor 1)
The ECU has detected a circuit or signal problem with the upstream oxygen sensor on Bank 1.
What this code means
The ECU has detected a circuit or signal problem with the upstream oxygen sensor on Bank 1.
Possible causes
- Failed oxygen sensor
- Exhaust leak near the sensor
- Damaged wiring or connector
- Fuel-mixture problem affecting sensor behaviour
Common symptoms
- Check engine light
- Rough idle or poor acceleration
- Reduced fuel economy
- Possible abnormal exhaust emissions
Checks to make
- Inspect sensor wiring and connector
- Check for exhaust leaks
- Review upstream O2 sensor live data
- Check related fuel-trim codes
Safety
- Do not replace parts from the code alone. Confirm the fault with live data, wiring checks and manufacturer procedures. Keep clear of hot or moving engine components.
Model notes
The code definition is generic; exact diagnostic thresholds, component locations and repair procedures vary by vehicle.