Mine does the same thing. Just haven't has time to take apart the console. Plus, I don't know how!

I can get it to engage by moving the shift lever to the "4" spot, then lightly slapping it over into the "D" spot.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport