First, check the voltage of the battery and make sure that its at proper voltage, then check your alternator. you should also look underneath your x to make sure the installer did not burn or tear any wires pertaining to the transmission which sits pretty close to the area he was working by. you can also do the tranny reset which can clear your tranny, just do a search on this to find the proper procedure. good luck

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2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD