That seems pretty obvious. The key that gives me the "START ERROR" message is the original key the car came with, and it has never been re-cut or re-keyed, and the rest of the remote still functions flawlessly (both RF and IR functions) ?!

How does the walet key work ? It's too small to contain a transponder, yet there's no "START ERROR" message when I use it.

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1998 SL 500 Sport (Samantha)
2005 E 55 AMG (Dr. Jekyl)