Start with the vacuum hoses. I was able to get away with a $7 hose repair to solve the problem. BMW vacuum hose seems programmed to die within a few years of fitting.

__________________
Sent via Telegraph Wires using my Morse Key.
2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i