Dan-P

Hi all, I'm hoping I can get some help on this, my B7 avant has an intermittent fault with alarm as it will keep setting itself off for weeks and weeks and will then stop for a few days to sometimes a month. It has been plugged in and has said it is the rear glass breakage sensor. Anyone have an idea if it means the rear boot lid glass? Or the small quarter glass panels in the boot? Any help would be brilliant cheers