Due to wear, high usage vehicles can experience ignition lock and tumbler failures. The ignition lock cylinder will generally require replacement to correct this concern.Google+
Car Problem Reports
Mercedes-Benz SLK320 High Usage Vehicles May Experience Ignition Lock and Tumbler Failures
Mercedes-Benz SLK320 Problem
Visitor, 2003 Mercedes-Benz SLK320, 35,500 mi
Key will insert but it will not turn... moving the steer wheel the few inches allowed back and forth will eventually allow unlocking the ignition and starting the engine. another problem that has developed is that when putting the transmission in drive... it have stayed in 1st gear and will not shift.... would this be as any result of the ignition switch problem?
Ted T. Gilstrap 850-244-1814 U.S.A.