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I had this issue with my M550. First time they dried the car out (it wasn't wet but it did happen at a time when it was extraordinarily humid). Next time they zip tied a cable up underneath the seat. That worked for awhile, but ultimately error came back. BMW wanted the dealer to go back to step 1. I raised a stink, no way it got wet this time unless water was coming in from the outside of the car. Dealership went to bat for me and got a whole new sensor (a pad of some kind) and replaced it in the seat bottom. Fairly pricey repair so I'm told, they had the car for a couple days.
Been fine since then.
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