I have an '06 X3 with 149,000 miles, and I had a serious issue that won't be diagnosed until at least tomorrow. I wanted to know if the Bimmerfest community has any ideas. I was driving around town on Friday, and started to hear/feel metal on metal grinding in drive and reverse. I found the closest dealership, and decided to drive there to have them check it out. I began to hear a thunking noise, similar to what you hear when you drive over a manhole cover, but there weren't any manhole covers. Finally, as I was braking, there was an awful feeling through the brake pedal that FELT like a chunk of metal was between the rotor and pad. Soon after I felt that, while braking for a red light, the car locked up, and screeched to an uncontrollable halt. I had a "Service Engine Soon" light that came on the day before, but there were no other error lights, even after the car died. I had it towed the quarter mile to the nearest dealer, and it is sitting there until it opens up tomorrow. I am fearing some catastrophic problem, i.e. transmission, transfer case, and wanted to hear from you guys.