Yep has been reported a few times including myself. The sensor is behind the SEAT logo on grill. Any heavy rain or a jet wash can cause this fault to pop up. A wipe down or left to dry always clears it. 😀
Yes I had it yesterday in the heavy rain and I was a little concerned and rang the dealer and they said that the sensor is within the grill and it could be the amount of rain causing it to trigger. Just thankful it didn't trigger the brakes, but I at least know what it is now.
Had this once or twice on the Ateca, and unusually (for a change) on the Polo FCA system the other (damp) morning, but it cleared within 10 minutes of driving and the FCA and ACC became available again. Seems to be a reasonably common occurrence on the Ateca according to members of the forum.