P2001: The NOx trap on bank 2 is operating below the efficiency threshold
The NOx trap on bank 2 is operating below the efficiency threshold.
| Code | P2001 |
|---|---|
| System | Engine and transmission |
| Group | P20xx, Emissions: catalysts and AdBlue |
| Type | Generic: it means the same on every make |
How to read and clear P2001 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2001 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2000 The nitrogen oxide trap on bank 1 removes less pollution than required
- P2002 Diesel particulate filter efficiency below threshold (bank 1)
- P2003 Diesel particulate filter efficiency below threshold (bank 2)
- P2004 Intake manifold runner control stuck open (bank 1)
- P2005 Intake manifold runner control stuck open (bank 2)
- P2006 Intake manifold runner control stuck closed (bank 1)
- P2007 Intake manifold runner control stuck closed (bank 2)
- P2008 Intake manifold runner control circuit open or faulty (bank 1)
- P2009 Intake manifold runner control circuit low (bank 1)
What does code P2001 mean?
The NOx trap on bank 2 is operating below the efficiency threshold.
How do you clear P2001?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2001 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
