P040F: EGR temperature sensors A and B do not agree
EGR temperature sensors A and B do not agree. Check the sensors, connectors and compared signals.
| Code | P040F |
|---|---|
| System | Engine and transmission |
| Group | P04xx, Emissions control |
| Type | Generic: it means the same on every make |
How to read and clear P040F 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 P040F 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
- P040B The exhaust gas recirculation temperature sensor A gives readings outside the
- P040C The exhaust gas recirculation temperature sensor A gives a lower signal than
- P040D The exhaust gas recirculation temperature sensor A gives a higher signal than
- P040E The exhaust gas recirculation temperature sensor A fails now and then
- P0410 Secondary air injection system malfunction
- P0411 Secondary air injection incorrect flow detected
- P0412 Secondary air switching valve A circuit malfunction
- P0413 The secondary air injection system switching valve A has a broken or
- P0400 Exhaust gas recirculation (EGR) flow malfunction
- P0401 Exhaust gas recirculation (EGR) flow insufficient
- P0402 Exhaust gas recirculation (EGR) flow excessive
- P0403 EGR control circuit malfunction
What does code P040F mean?
EGR temperature sensors A and B do not agree. Check the sensors, connectors and compared signals.
How do you clear P040F?
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, P040F 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.
