P2A4B: The alternative fuel temperature sensor has an electrical fault
The alternative fuel temperature sensor has an electrical fault. It may be the part itself, its connector or the wiring.
| Code | P2A4B |
|---|---|
| System | Engine and transmission |
| Group | P2Axx, Engine and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P2A4B 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 P2A4B 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
- P2A47 The alternative fuel tank C pressure sensor gives readings outside the normal
- P2A48 The alternative fuel tank C pressure sensor gives a lower signal than normal
- P2A49 The alternative fuel tank C pressure sensor gives a higher signal than normal
- P2A4A The alternative fuel tank C pressure sensor fails now and then
- P2A4C The alternative fuel temperature sensor gives readings outside the normal range
- P2A4D The alternative fuel temperature sensor gives a lower signal than normal
- P2A4E The alternative fuel temperature sensor gives a higher signal than normal
- P2A4F The alternative fuel temperature sensor fails now and then
- P2A00 O2 sensor circuit range/performance (bank 1, sensor 1)
What does code P2A4B mean?
The alternative fuel temperature sensor has an electrical fault. It may be the part itself, its connector or the wiring.
How do you clear P2A4B?
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, P2A4B 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.
