P237A: The lambda sensor exhaust sample (bank 1, sensor 2) is not working properly
The lambda sensor exhaust sample (bank 1, sensor 2) is not working properly. It may be the sensor itself, its connector or the wiring.
| Code | P237A |
|---|---|
| System | Engine and transmission |
| Group | P23xx, Ignition coils and engine |
| Type | Generic: it means the same on every make |
How to read and clear P237A 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 P237A 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
- P2375 The turbocharger intake pressure sensor B gives readings outside the normal
- P2376 The turbocharger intake pressure sensor B gives a lower signal than normal
- P2377 The turbocharger intake pressure sensor B gives a higher signal than normal
- P2378 The turbocharger intake pressure sensor B fails now and then
- P237B The lambda sensor exhaust sample (bank 2, sensor 2) is not working properly
- P237C The exhaust heat exchanger exhaust bypass valve A control has a broken or
- P237D The exhaust heat exchanger exhaust bypass valve A control gives a lower signal
- P237E The exhaust heat exchanger exhaust bypass valve A control gives a higher signal
- 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 P237A mean?
The lambda sensor exhaust sample (bank 1, sensor 2) is not working properly. It may be the sensor itself, its connector or the wiring.
How do you clear P237A?
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, P237A 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.
