Many thanks JMP. Got an original VW part ordered for £15 delivered so happy days! Will give it a go this weekend if the replacement arrives before then. I have no access to a vag com, only an ODBII tool which shows no errors - hoping that its just the one sensor which is the issue as the others seem to respond to going into reverse with the internal clicking I mentioned. Do you just paint the top circle of the sensor or do you paint around the sides too? Thinking of getting this done first before taking the bumper off.