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All I can find for the error 20 is that it is the Occupancy Sensor in the passenger seat, so one would have to assume the mat. Any time I enquire to those that would really know they say to have it hooked up to the BMW GT1 diagnostic computer. The local BMW dealer wants $150 just too hook up the car and tell you what it says plus whatever it costs to fix it and they dont even credit the diagnostic fee if you move forward with the repair. While I would prefer to fix it correctly, I have a hard time justifying the fee. I may head down that path eventually, but I like the idea of the bimtronics gizmo I found. Wish I knew someone with the GT1 :-) Thought about buying one. If you have to use it 3 or 4 times it would pay for itself.
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