At 4500 miles my X35d showed No start in 999 miles. Checking iDrive in Check Control message, it says something about Exhaust fluid. After a day, the error went away. I called the Service dept and took the truck there yesterday. I'm picking it up later today and the SA said that they loaded a new software update. Seems that there was a bug in the programming that throws an erroneous error. Will post here once I see the Service document.