P23B3: The NOx sensor heater control (bank 1
The NOx sensor heater control (bank 1, sensor 3) gives a higher signal than normal. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P23B3 |
|---|---|
| System | Engine and transmission |
| Group | P23xx, Ignition coils and engine |
| Type | Generic: it means the same on every make |
How to read and clear P23B3 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 P23B3 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
- P23AF The NOx sensor (bank 1, sensor 3) gives a higher signal than normal
- P23B0 The NOx sensor (bank 1, sensor 3) fails now and then
- P23B1 The NOx sensor heater control (bank 1
- P23B2 The NOx sensor heater control (bank 1
- P23B4 The NOx sensor heater detection (bank 1, sensor 3) has an electrical fault
- P23B5 The NOx sensor heater detection (bank 1
- P23B6 The NOx sensor power supply voltage (bank 1, sensor 3) has an electrical fault
- P23B7 The NOx sensor heater control (bank 1
- 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 P23B3 mean?
The NOx sensor heater control (bank 1, sensor 3) gives a higher signal than normal. It is usually the sensor itself, its wiring or a real fault in what it measures.
How do you clear P23B3?
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, P23B3 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.
