Parking sensor fault after fixing

[jw4821]

Hi, I had an issue with my parking sensors on my 2018 Berlingo van. Replaced all 4 sensors which brought everything back to life however when engaging reverse for a brief second the fault light and associated pop up on the screen appears, before disappearing. Sensors continue to work fine. 

Is there a way to stop the fault message from appearing briefly? Some sort of reset? Tried leaving the battery disconnected but this didn’t do anything.

[Sol]

Reading and re-setting of stored fault codes is required. Unless you have an inner and outer sensor swapped over (they are often not the same on parking sensor systems) and it notices but uses it anyway. BMW sensors are like this, the waveguides inside each sensor are tuned for the position they occupy on the bumper and swapping them around causes a fault to be generated. Although I've had Citroen PDC I've never messed with it as I never needed to. But I have on BMW systems.

There is no off the shelf OBD gadget that can do this however, not on the PDC ECU, this would need Citroen Diagbox OEM software or a pro aftermarket system like Snap-On or Autel MaxiDiag / TopDon etc.