2008 m5. I've tried three different cables, including the one that came with the famous "$9 bluetooth solution," and two different phones. The audio on all other forms of sound (SAT, FM, AM, etc.) all sound fine, but when I use my AUX port the sound only comes from the passenger side. I've adjusted all of the settings on the car, and the phone and have yet to find a solution. I'm guessing the port itself is bad. Anyone have any experience with this type of thing?