P2000
NOx Trap Efficiency Below Threshold Bank 1
2002-2005 Audi A4 3.0L V6 🇩🇪
High SeverityPowertrain
Description
The NOx storage catalytic converter on bank 1 is not efficiently reducing nitrogen oxides.
Symptoms
- Check engine light
- Failed emissions test
- Reduced fuel economy
Common Causes
- Degraded NOx trap
- Sulfur contamination
- Exhaust leak before sensor
- Faulty NOx sensor
Diagnostic Steps
- Read freeze frame data
- Check NOx sensor readings upstream and downstream
- Inspect for exhaust leaks
- Perform desulfation procedure if applicable
Repair Notes
Replace NOx trap if desulfation fails. Check upstream components for causes of contamination.
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
P2000 on Other Vehicles
Common Questions
What does code P2000 mean on a 2002-2005 Audi A4?
P2000 stands for "NOx Trap Efficiency Below Threshold Bank 1". The NOx storage catalytic converter on bank 1 is not efficiently reducing nitrogen oxides.
What are the symptoms of P2000 on a Audi A4?
Common symptoms of P2000 include: Check engine light, Failed emissions test, Reduced fuel economy.
What causes P2000 on a 2002-2005 Audi A4?
Common causes of P2000 include: Degraded NOx trap, Sulfur contamination, Exhaust leak before sensor, Faulty NOx sensor.