P23AB: The NOx sensor processor (bank 1
The NOx sensor processor (bank 1, sensor 3) gives readings outside the normal range. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P23AB |
|---|---|
| System | Engine and transmission |
| Group | P23xx, Ignition coils and engine |
| Type | Generic: it means the same on every make |
How to read and clear P23AB 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 P23AB 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
- P23A6 The exhaust heat exchanger exhaust bypass valve B has got stuck
- P23A7 The exhaust heat exchanger exhaust bypass valve B has got stuck
- P23A8 The exhaust heat exchanger exhaust bypass valve B position sensor stop gives
- P23AA The turbo A discharge valve has got stuck
- P23AC The NOx sensor (bank 1, sensor 3) has an electrical fault
- P23AD The NOx sensor (bank 1, sensor 3) gives readings outside the normal range
- P23AE The NOx sensor (bank 1, sensor 3) gives a lower signal than normal
- P23AF The NOx sensor (bank 1, sensor 3) gives a higher signal than normal
- P2300 Ignition coil A primary control circuit low
- P2301 Ignition coil A primary control circuit high
- P2303 Ignition coil B primary control circuit low
- P2304 Ignition coil B primary control circuit high
What does code P23AB mean?
The NOx sensor processor (bank 1, sensor 3) gives readings outside the normal range. It is usually the sensor itself, its wiring or a real fault in what it measures.
How do you clear P23AB?
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, P23AB 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.
