P2BAD: NOx emissions have exceeded the limit, and the cause is unknown
NOx emissions have exceeded the limit, and the cause is unknown.
| Code | P2BAD |
|---|---|
| System | Engine and transmission |
| Group | P2Bxx, Engine and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P2BAD 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 P2BAD 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
- P2BA9 NOx emissions have exceeded the limit because the reductant fluid quality is
- P2BAA NOx emissions have exceeded the limit
- P2BAB NOx emissions have exceeded the limit because the EGR flow is incorrect
- P2BAC NOx exceedance: EGR deactivated
- P2BAE The NOx control monitor has detected that the emissions limit was exceeded
- P2BB0 The alternative fuel consumption gives a lower signal than normal
- P2BB1 The alternative fuel consumption gives a higher signal than normal
- P2BB4 The engine 4 coolant temperature sensor fails now and then
To understand it properly
We explain how that system works, with drawings and no waffle, in our mechanics guide: AdBlue.
What does code P2BAD mean?
NOx emissions have exceeded the limit, and the cause is unknown.
How do you clear P2BAD?
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, P2BAD 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.
