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The alarm on my 147 keeps going off. The LED on the dash which flashes to tell you why the alarm went off is flashing four times. According to the hand book that means 'ultrasounds'.

So what the hell is ultrasounds?
 

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These are the volumetric sensors in the car.

You may have a fly or a spider in the car setting the alarm off.

Try closing all the vents and having a good vacuum round inside.

Other than that one of the window's may not be fully shut.
 
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