P209E: Signals A and B from the reductant injection air pressure sensor disagree
Signals A and B from the reductant injection air pressure sensor disagree. Check the sensor, its connector and the comparison signal.
| Code | P209E |
|---|---|
| System | Engine and transmission |
| Group | P20xx, Emissions: catalysts and AdBlue |
| Type | Generic: it means the same on every make |
How to read and clear P209E 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 P209E 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
- P209A The AdBlue injection air pressure sensor B has an electrical fault
- P209B The AdBlue injection air pressure sensor B gives readings outside the normal
- P209C The AdBlue injection air pressure sensor B gives a lower signal than normal
- P209D The AdBlue injection air pressure sensor B gives a higher signal than normal
- P209F The AdBlue tank heater control gives readings outside the normal range
- P20A0 The AdBlue purge valve has an open circuit
- P20A1 The AdBlue purge control valve gives readings outside the normal range
- P20A2 The AdBlue purge control valve gives a lower signal than normal
- 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 P209E mean?
Signals A and B from the reductant injection air pressure sensor disagree. Check the sensor, its connector and the comparison signal.
How do you clear P209E?
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, P209E 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.
