Gilly: If the radio is not coded as you suggest it might not be, then I am very disappointed in the technical division of MBNA giving out such information. My experience with Mercedes is that they are pretty accurate when they say something, so I imagine it is possible that the electronics of the radio will only recognize the chip in a particular key to function as does the starting and fuel delivery systems. Certainly a simple test would be to plug a radio from a 2001 C or S class into another chassis and see if it will work. I am anxious to see if you get some new information on this question. RSL007

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RSL007
1999 ML430
2001 C320 Sport
2000 SAAB 9-5
1998 E300DT
1998 C280sport
1991 300D
1991 350SDL
1982 300DT
1972 Porsche 911 Targa