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The alarm on my year 2000 Xantia 2.0XSi keeps going off on very cold weather. It seem to be down to the ultrasonic sensors because it doesn't happen when i disable them. Citroen dealer has replaced sensors twice and claims to have replaced central control unit too, but it still happens. Typical scenario is, lock car after use at 17:30, weather turns cold (2 deg C or less), alarm goes off about 03:00 next morning. Time varies with temperature (colder = quicker). Run out of ideas. Has anyone else experienced this ??
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My XM has the same factory fitted alarm and here in east Germany it can reach -30c and my alarm has never gone off so I suggest there is another problem probably due to cold air within the car causing a draught .Try shutting all the air intakes at night normally cures it.
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