P0131
O2 Sensor Circuit Low Voltage Bank 1 Sensor 1
2006-2011 BMW 325i 3.0L I6 N52 🇨🇦
Moderate SeverityPowertrain
Description
The upstream O2 sensor voltage on Bank 1 is staying below 0.45V, indicating a lean condition or sensor fault.
Symptoms
- Check Engine Light
- Lean running
- Poor fuel economy
- Rough idle
Common Causes
- Vacuum leak
- Faulty O2 sensor
- Exhaust leak before sensor
- Low fuel pressure
- Faulty fuel injector
Diagnostic Steps
- Check for vacuum leaks
- Monitor O2 sensor voltage
- Test fuel pressure
- Perform smoke test on intake
- Inspect O2 sensor
Repair Notes
Fix vacuum or exhaust leak. Replace O2 sensor if confirmed faulty.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0131 on Other Vehicles
Common Questions
What does code P0131 mean on a 2006-2011 BMW 325i?
P0131 stands for "O2 Sensor Circuit Low Voltage Bank 1 Sensor 1". The upstream O2 sensor voltage on Bank 1 is staying below 0.45V, indicating a lean condition or sensor fault.
What are the symptoms of P0131 on a BMW 325i?
Common symptoms of P0131 include: Check Engine Light, Lean running, Poor fuel economy, Rough idle.
What causes P0131 on a 2006-2011 BMW 325i?
Common causes of P0131 include: Vacuum leak, Faulty O2 sensor, Exhaust leak before sensor, Low fuel pressure, Faulty fuel injector.