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Tried that when I washed the car this evening, still the same. No towbar or anything like that. It was fine one day and after a long drive up the country it seemed to stop working the next morning.

Thanks for the response. Whats the best method? Wiping them over or flushing with water?

Hello, my 07 Berlingo has factory fitted parking sensors, however, they have not been working correctly recently. When I press the button on and select reverse I get a beep followed by a longer higher pitched tone (similar or the same as the continuous tone when near an object). The manual doesn't contain any instructions on how this works or faults. I can't see anything obviously wrong with the sensors, could anyone suggest anything before I end up taking it in somewhwere. Thanks.