Everything else works as it should. I can't shift the car without pressing the brake. I can't take the key out until its in park. The car does shut off immediately though, unlike my other old benz's that have a vacuum shutoff. So I guess i need to replace the lock cylinder? I wonder if the p.o. did this once already? The round key unlocks the door and the square one starts the car. They won't do anything else. My older benz's the one key can do both.

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Current fleet-
2015 BMW 750i xDrive
2009 BMW 535i xDrive
2004 Chevy Avalanche 4x4
1993 Mercedes 300SD
1993 Mercedes 300SE (parts car)

Previous Benz's-
2001 Mercedes SL500
1983 Mercedes 300SD
1980 Mercedes 300TD
1996 Mercedes E300D
1999 E300DT
1984 300TD-T
1988 Mercedes 560SEL (parts car)
1979 300SD
2003 E500
2004 S430 4Matic
2001 E55
2003 E430