Another potential downside: if you park near a large cell tower or other source of certain radio interference, the remote may not work at all. Happens to me 90% of the time I park at my local grocery store (right across the street form a huge AT&T tower complex). Every time it does, I am thankful that I haven't done this modification as I lock/unlock the old fashioned way.

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'01 X5
'98 M3
'73 /5