Rear parking sensors gone crazy

[n1nja-frog]

I have a strange intermittent fault - sometimes, when putting into reverse the sensor beeps go nuts so much so it's almost a solid beep - I assume this means either a duff sensor or is there anything else to check out?

 

[Dale_B]

When the car is in reverse put your ear next to each actual sensor, they should 'click' repeatedly, if there is a sensor fail then there won't be any noise coming from it.
Worth a check next time it happens.

 

[Bumpy]

I assume there isn't any debris obscuring the sensor.
Snow or road crap usually is the culprit on my Honda Van

 

[AnttiO]

Read fault codes with DIS, INPA or BMWhat. Then you know exactly what is the problem. It tells you which sensor is faulty.

 

[RedLine]

The rear sensors on my Landy go bonkers after being driven in heavy rain. Once they're dry again all is fine. I suspect one is letting in water. Maybe the same with yours.