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Strange PDC behaviour

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My daughter's FII from 2009 seems to have a problem with the rear PDC.

When in reverse there is a constant beep as if an obstacle is next to the car / sensor. It is not the failure beep sound.

I checked it with VCDS and all sensors are "working" with no DTC. One however almost always shows 34cm while the others show 255cm when there is no obstacle. When approaching from the 34cm side the display will not put anything on screen.

I noticed that the sensors also seem to check against one another when I was going through the output measurements on VCDS and if there is an implausible result - I guess - they do not display anything. Occasionally the sensor flips back to normal function.

Has anyone come across this?

 

It is one of the original ones and a replacement is on order.

Edited by 26DIPP

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