For the money the foxwell scan tool is the best bang for the buck for diagnostics on the fly and can be kept in the back hatch storage compartments with no worry of it getting damaged. That's where I keep mine.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install