[marv85]

Originally Posted by skinrock

Has to be plugged in. There's a thread right here on the first page about using a universal device mount to hold it up. If you really like it, you could probably run the wire through the air vent and minimize the exposure of the actual cable, but the OBD port is still always visible down by the hood release. It would still be pretty neat.

http://www.e90post.com/forums/showthread.php?t=638850