A long time ago a forum member reported something akin to this and found that the LED had been removed from the SES light position on the dash motherboard. Being adept with a soldering iron and having a Radio Shack nearby he went and bought a suitable mini LED and soldered it into the SES position. That is when he found that his SES was on. Many hours and $$$$$ later he found out why his SES LED had been removed by the previous owner - so he could sell the vehicle!
Be prepared.

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2015 X5 xDrive35i MSport
2013 X5 xDrive35i