I have a 2009 620I. It has been a great machine that has taken it's share of abuse between choring on the farm and following coon hounds at night. I have been having problems getting the 4 wheel drive engage. At first, I thought the switch was bad, so replaced it. It works once in a while, but most of the time it won't. I have unplugged and plugged the 3 junction plugs up under the dash. Sometimes after I have done that, it will work, then the next time it won't. Has anyone else had this problem and if so what can be done to resolve it?
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