Problem with reverse sensors

Mollygoogle

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My reverse sensors have started acting up. I get the beep as I go in to reverse but then they don't sense anything. Can VAGCOM identify which one(s) has/have failed or do I just need to replace the lot? I assume it is likely to be the sensors rather than the wiring?

I've done the whole 'stick your ear against the sensor' thing but can't tell whether they are ticking/buzzing or not.
 
VCDS will tell you which sensor(s) is faulty, the system switches off if a sensor goes down hence the long beep when you first go into reverse.
 

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