Wilsonville MB informed me of the problems with the Sprinter and that they are actually working on it. However, the real problem is that they and most other dealers are woefully lacking in technicians that truly understand the complex emissions "patchwork" systems. I am not so sure that I would again purchase an MB Sprinter again given the expense and problems with today's engine complexities with their failure history. Though, even I with over 50 years experience with complex computer systems and with a basic knowledge of how the NOx systems "should" work would not even attempt to try to diagnose and restore the proper functioning of the MB system. Let's hope that we can resume our trip to see our grandchildren before we can't drive anymore.