The drain channels of the panoramic roof block up or crack, water runs into the cabin, the carpet soaks through, and the electronics in the floor get wet too. It shows up on cars built between 2019 and 2021. A car without a roof is not affected, but a listing does not always say whether a roof was fitted, so you have to look.
What to check
- Check whether the car has a panoramic roof at all
- Pour water into the four corners of the roof, and see where it drains underneath
- Lift the front and rear carpets and feel the foam