What is this noise

Driving after a period of hard frost, my 9000 plunged into a deep pothole in the road. It pothole was invisible at night on a dark road. Immediately a whirring sound started from the front, the sound did not appear related to engine or car speed, so I assumed it was from an electric motor of some kind. The sound disappeared after a while. Wheels and tyres appear undamaged.

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johannes
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