The 1998 & later cars with the "SMART" key can have a total of 24 keys before there is any problem. THE dealer MUST request the correct sequence replacement key or the replacement key can make one of the other keys inop.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator