I got the same thing not long ago. It drove me nuts that I had a warning light without a message in idrive. Had to go to the manual to figure out what the icon was. The code it threw was faulty ambient temp sensor DME F/C 2BCO. They changed the sensor, the light came back on a day later and went out again a day or two after that.

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Current:
2016 X6 ///M Black Sapphire Metallic