I have an N reg 306 xsi. A few months ago I had the alarm ecu replaced and\nsince then each time I set the alarm it goes off every 5 mins. After my\nlocal dealership have had the car for a full day they think the problem is\nwith the ultrasonic sensors. Disabling the sensors by pressing the button on\nthe steering column stops the alarm from going off. Can anyone tell me how\nthe sensors can be made less sensitive? Or how much it would cost to replace\nthem? If the expense gets too much I'm looking at having a different alarm\nfitted and just turning the original one off. (I'm told that it could be a\ngap in one of the seals around the doors or windows triggering the sensors)\nAny suggestions on what I should have fitted? Has anyone had similar\nproblems? Any help appreciated, I'm trying to find the easiest solution and\nam not fussed about using my local dealership to do it (have lost faith in\nthem along the way).