P225A: The NOx sensor calibration memory (bank 1, sensor 1) is not working properly
The NOx sensor calibration memory (bank 1, sensor 1) is not working properly. It may be the sensor itself, its connector or the wiring.
| Code | P225A |
|---|---|
| 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 P225A 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 P225A 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
- P2256 The lambda sensor negative current control (bank 2
- P2257 The secondary air injection system control A gives a lower signal than normal
- P2258 The secondary air injection system control A gives a higher signal than normal
- P2259 The secondary air injection system control B gives a lower signal than normal
- P225B The NOx sensor calibration memory (bank 1, sensor 2) is not working properly
- P2260 The secondary air injection system control B gives a higher signal than normal
- P2261 The turbocharger or supercharger bypass valve has a fault
- P2262 No turbo boost pressure is detected
- 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 P225A mean?
The NOx sensor calibration memory (bank 1, sensor 1) is not working properly. It may be the sensor itself, its connector or the wiring.
How do you clear P225A?
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, P225A 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.
