P0431
Warm Up Catalyst Efficiency Below Threshold Bank 2
2012-2015 BMW 320i 2.0L I4 Turbo N20
Moderate SeverityPowertrainGeneric (SAE)
Description
Bank 2 warm-up catalyst efficiency is below threshold.
Symptoms
- Check Engine Light
- Failed emissions
Common Causes
- Worn catalyst
- Rich running during warmup
- O2 sensor issue
Diagnostic Steps
- Monitor catalyst
- Compare O2 signals
- Check exhaust
Repair Notes
Replace warm-up catalyst if confirmed.
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
P0431 on Other Vehicles
Common Questions
What does code P0431 mean on a 2012-2015 BMW 320i?
P0431 stands for "Warm Up Catalyst Efficiency Below Threshold Bank 2". Bank 2 warm-up catalyst efficiency is below threshold.
What are the symptoms of P0431 on a BMW 320i?
Common symptoms of P0431 include: Check Engine Light, Failed emissions.
What causes P0431 on a 2012-2015 BMW 320i?
Common causes of P0431 include: Worn catalyst, Rich running during warmup, O2 sensor issue.