I Have A 2000 / S 430. One Smart Key Became Inoperable And Will Not Work In The Ignition Although It Will Open Doors And Trunk. The Dealer Says That I Must Buy A New Programmed Key For About $200. The Second Smart Key And "wallet" Key Both Function Properly. Any Ideas About Getting The Inoperable Key To Work Again. Thanks.[/b]

Jerrycee

Sorry that I am unable to help solve the key function problem, but if you do need a new key, check out the W220 forum for a Smart Key source at a great price!

https://mbworld.org/forums/s-class-w220/177924-got-my-very-cool-new-style-oem-smart-key-today.html

Hope you get it figured out!