Proximity detector going crazy

[DrJon]

My off-side front proximity detector suddenly started beeping like a madman for no apparent reason. Seems to be worse when stopped at traffic lights for example. I cant see anything on the car like a stuck leaf or whatever. Any ideas what's going on? Or indeed - how to stop it! Thanks

 

[onefortheroad]

Apparently they pick up waves from things like traffic lights, lamp posts etc. Whats it like on open roads ?

 

[DrJon]

Not sure about the open road, we live in the city. But it is true that it didn't happen when we were just driving along. Can they be re-set/re-calibrated?

 

[richlumb]

I had that once on a W204 I had I just gave them all a really good clean and it never did it again, also heard of sensors failing and people replacing them before

 

[DrJon]

Many thanks, will certainly give that a try