Well, on previous models like the E53, E46, E38, E39 etc. it was the mirror motor, as it has the position sensors that know/remember where your mirror is built into it. I'm not entirely sure if it is the same for the E70 as I haven't came across this issue on one yet, but it is likely.

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X5 pics

RIP 4.6is.....

2003 4.6is