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If they unplugged the sensor it will need initialised. It takes seconds with INPA or obviously any dealer or indy that has it.
I had the same problem on a 5 series a few years ago. You would think they would be informed how to do this as auto wiper sensors have been about for years now.
EDIT: I had to pay to get it done but it was refunded by the insurer. Just needed to send in the receipt.
Incidently my rain sensitivity was getting hopeless recently so I re-initialised it with INPA and its back to being spot on again.
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