It is quite possible that the mechanism has come loose from the back of the lever. Looking at this when I changed out my wondow motor, I could see how this would be an easy thing to do. Before taking it to someone to fix it, follow the directions on this board on removing the inner door panel and see if that is the problem before paying to have someone diagnose it.

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!