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Parking sensors always beeping

As I put my Vectra into reverse the parking sensors immediately start beeping constantly, as if telling me I am near a obstacle without any obstacles behind me. I put it back in to neutral and it stops.

What is the problem as its only just started happening today?

Asked on 28 December 2012 by skennyboy20

Answered by Honest John
Dirt on the sensors or moisture ingress to them.
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