P2001
NOx Trap Efficiency Below Threshold Bank 2
2001-2005 BMW 330i E46 3.0L I6 🇨🇦
High SeverityPowertrain
Description
The NOx storage catalytic converter on bank 2 is not efficiently reducing nitrogen oxides.
Symptoms
- Check engine light
- Failed emissions
- Slight power loss
Common Causes
- Degraded NOx trap bank 2
- Sulfur poisoning
- Exhaust leak
- NOx sensor fault
Diagnostic Steps
- Check NOx sensor output bank 2
- Compare to bank 1
- Inspect exhaust for leaks
Repair Notes
Replace NOx trap bank 2 if regeneration fails.
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
P2001 on Other Vehicles
Common Questions
What does code P2001 mean on a 2001-2005 BMW 330i E46?
P2001 stands for "NOx Trap Efficiency Below Threshold Bank 2". The NOx storage catalytic converter on bank 2 is not efficiently reducing nitrogen oxides.
What are the symptoms of P2001 on a BMW 330i E46?
Common symptoms of P2001 include: Check engine light, Failed emissions, Slight power loss.
What causes P2001 on a 2001-2005 BMW 330i E46?
Common causes of P2001 include: Degraded NOx trap bank 2, Sulfur poisoning, Exhaust leak, NOx sensor fault.