Star Diag. may not be required to disable dyno mode, here is how to disable for MB on a 2002 W203 chassis, M211 engine:

http://www.csportcoupe.com/faq.shtml#2

Having not seen a crossfire since the Detroit auto show, I can't offer much more help. Consider this a clue.

Additionally, 2003 coupes with M271 engine use a different procedure.

When it is disabled it returns upon the next start up.