BMW is aware of problems with the comfort access. There is a software update in the works. I just got my vehicle back from the dealer and that was one of the things they looked at. Mine works intermittantly. The dealer said that it has something to do with the vehicle's "sleep mode". Ask your dealer about updates. Here in Canada it will not be available until late this year.

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2013 BMW X6M-current
2013 Audi S4-current
2007 BMW X5 4.8i (E70)-sold