I am in the process of replacing the coolant expansion tank. I have done this before ( but it was what, a decade ago?!? :-) Anyway, I don't know if I left this disconnected last time I did this, but I can't find the electrical plug that goes to the coolant level sensor at the bottom of the coolant expansion tank.

Is there actually one in this vehicle? If my memory serves me well, I think there isn't one... 2001 BMW X5 3.01 (10/00 production)