P22A8: The NOx sensor heater detection (bank 1
The NOx sensor heater detection (bank 1, sensor 2) gives a lower signal than normal. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P22A8 |
|---|---|
| System | Engine and transmission |
| Group | P22xx, NOx sensors, oxygen sensors and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P22A8 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 P22A8 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
- P22A4 The NOx sensor heater control (bank 1
- P22A5 The NOx sensor heater control (bank 1
- P22A6 The NOx sensor heater detection (bank 1, sensor 2) has an electrical fault
- P22A7 The NOx sensor heater detection (bank 1
- P22A9 The NOx sensor heater detection (bank 1
- P22AA The NOx sensor heater detection (bank 1, sensor 2) fails now and then
- P22AB The lambda sensor positive current control (bank 1
- P22AC The lambda sensor positive current control (bank 1
- P2200 NOx sensor circuit fault (bank 1)
- P2201 NOx sensor circuit range or performance problem (bank 1)
- P2227 Barometric pressure sensor A range or performance problem
- P2228 Barometric pressure sensor A circuit low
What does code P22A8 mean?
The NOx sensor heater detection (bank 1, sensor 2) gives a lower signal than normal. It is usually the sensor itself, its wiring or a real fault in what it measures.
How do you clear P22A8?
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, P22A8 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.
