did they happen to remove the door panels for some reason? If so might be a loose connection in the drivers door module. If it was regular tint i don't see how it would block the signal unless they damaged the antena on the rear window.

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04 X5 4.8is
76 2002

X-Pipe and Dinan Mufflers: www.youtube.com/watch?v=eWQh-izaTcY

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