P0139
O2 Sensor Circuit Slow Response Bank 1 Sensor 2
2006-2011 BMW 325i 3.0L I6 N52 🇩🇪
Low SeverityPowertrain
Description
The downstream O2 sensor on Bank 1 is responding too slowly.
Symptoms
- Check Engine Light
- Failed emissions
Common Causes
- Aging sensor
- Contaminated sensor
- Catalyst issue
Diagnostic Steps
- Monitor sensor response
- Check catalyst efficiency
Repair Notes
Replace downstream O2 sensor.
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
P0139 on Other Vehicles
Common Questions
What does code P0139 mean on a 2006-2011 BMW 325i?
P0139 stands for "O2 Sensor Circuit Slow Response Bank 1 Sensor 2". The downstream O2 sensor on Bank 1 is responding too slowly.
What are the symptoms of P0139 on a BMW 325i?
Common symptoms of P0139 include: Check Engine Light, Failed emissions.
What causes P0139 on a 2006-2011 BMW 325i?
Common causes of P0139 include: Aging sensor, Contaminated sensor, Catalyst issue.