Hi I have a 2002 slk 230 special edition..problem is I can start the car, but I cant turn it off, I can take the key out but the engine is still running...(everything else turns off except the engine)I have to stop it by taking out the fuel pump fuse, then disconnect the battery as dash is all lite up .
Any ideas? do I need a new tumbler in the ignition or a whole new assembly.
Thanks for any advise.

Kind of sounds like it might be new ignition switch time. Not familiar enough with the newer generation to suggest anything else other than might be a good idea to visit a dealer or indy.

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

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1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

Check out the link below to one of our site's DIY tech articles on the ignition switch. It should help you troubleshoot and resolve the issue. If you have anymore questions, feel free to post a Comment just below the article and we'll do our best to give you more details.

Mercedes-Benz SLK 230 Ignition Switch Lock Cylinder Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article


-Dmitry