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Check the manual for the alarm, often the LED will flash a code when disarmed to notify what has set it off.
Most false alarms are caused by water ingress or ultrasonic sensors detecting movement in the car, anything hanging from the mirrors that could sway around?
Worth pulling the covers off the ultrasonic sensors and checking for spiders, that was a very common cause on BMW 5 & 7 series :)
Fixedwheelnut
Car alarm (astra VXR) is going off intermittently. All times late at night.
A - it's faulty
B - it's being tripped by something innocent
C - it's being tripped by someone trying to gain access
What do I do?