P2256: The lambda sensor negative current control (bank 2
The lambda sensor negative current control (bank 2, sensor 1) gives a higher signal than normal. It is usually the sensor itself, its wiring or a real fault in what it measures.
| Code | P2256 |
|---|---|
| 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 P2256 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 P2256 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
- P2252 The lambda sensor negative current control (bank 1
- P2253 The lambda sensor negative current control (bank 1
- P2254 The lambda sensor negative current control (bank 2
- P2255 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
- P225A The NOx sensor calibration memory (bank 1, sensor 1) is not working properly
- 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 P2256 mean?
The lambda sensor negative current control (bank 2, sensor 1) 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 P2256?
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, P2256 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.
