P204A: The AdBlue pressure sensor has an electrical fault
The AdBlue pressure sensor has an electrical fault. It may be the part itself, its connector or the wiring.
| Code | P204A |
|---|---|
| System | Engine and transmission |
| Group | P20xx, Emissions: catalysts and AdBlue |
| Type | Generic: it means the same on every make |
How to read and clear P204A 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 P204A 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
- P2046 The AdBlue temperature sensor fails now and then
- P2047 AdBlue injector circuit open or faulty (bank 1, unit 1)
- P2048 The circuit signal of AdBlue injector 1 on bank 1 is low
- P2049 The circuit signal of AdBlue injector 1 on bank 1 is high
- P204B The AdBlue pressure sensor gives readings outside the normal range
- P204C The AdBlue pressure sensor gives a lower signal than normal
- P204D The AdBlue pressure sensor gives a higher signal than normal
- P204E The AdBlue pressure sensor fails now and then
- P2002 Diesel particulate filter efficiency below threshold (bank 1)
- P2003 Diesel particulate filter efficiency below threshold (bank 2)
- P2004 Intake manifold runner control stuck open (bank 1)
- P2005 Intake manifold runner control stuck open (bank 2)
What does code P204A mean?
The AdBlue pressure sensor has an electrical fault. It may be the part itself, its connector or the wiring.
How do you clear P204A?
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, P204A 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.
