[GoRomeo]

Originally Posted by LuisBoston

I have no clue where the water comes from. I am assuming that vent flap on the wheel well. But could also be coming from the drain channel at the base of the rear window.

But I have no broken/replaced taillight. But who knows.

Regardless, it’s a shitty design for BMW to put the electrical module at the bottom of a well with no way to drain

Totally 💯 correct 👍