It's a "brave New World" out there car wise. These new vehicles are so different from previous generations, that many of us (and most auto service techs) are familiar with, that diagnosing what would have been a relatively "simple" problem now involves tens of thousands of dollars worth of dedicated computing hardware that only the factory shops have access to, PLUS knowledge of very sophisticated computer and communication systems.
The cars are virtually impossible to modify in any serious way, and, as in this case, (and many more that have been discussed on this Forum) the dealer's Service Dept. employees "don't have a clue" and must communicate with some guy in Bavaria who may be only one of three people in the universe who understand some small aspect of the vehicle design well enough to come up with the solution.
Sorry for the rant, but I miss the "old days" when all you needed was a 12V. test light and a feeler gauge to set the "points" to get any car running.
Those days are gone forever.
Just try and buy a service manual for a X3. Not possible at any price.