get your self three things that will go wrong 1 a RCM or as Mercedes calls it K40,,,,2 a Bosch
crank sensor ,,,and #3 a Bosch cam sensor .
everyone that owns a crossfire should have these parts and tools to change the sensors ,
the most important is the RCM and it is a plug and play .it is the 2nd thread under How to's
Oh,,, welcome to a great car forum.. jim home of the ""worlds fastest crossfire"" see U-Tube