I feel your pain. Happened to me a few months back. If you buy a new controller than you have to get it coded from dealer. I purchased a used I-drive controller from Weber Bros. 1-800-222-2528 x-100 ask for Craig. I paid $75 for the controller and plugged it in.... Worked like a charm with no coding needed.

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2007 E70 X5 4.8i -- current
2001 E46 330ci. -- sold
1998 E39 540i 6 spd -- sold