I had that warning last week, car was not wet at all. It went away at next stop.start cycle.
This is the issue with such complex cars, a sensor goes wonky and you have to worry about some actual failure in the car!
Mike
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2018 M5 and 2019 Porsche Boxster GTS
Prior. '94 325is, '97 M3 Lux, '16 M2
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