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Now that I think about it I do have a Bluetooth OBDII dongle that I leave plugged in 24/7. It's probably constantly drawing power, but I've had it for years now. I'll unplug it and see what happens.
I also only ever see the message when it's cold though. Very strange.
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I rev-match from neutral to first 
6MT Mineral White on black M235i coupe
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