Before I bought the car I ran a carfax and it did not show any accidents. Unfortunately yesterday I spoke with the guy I bought it from who talked to the dealer he bought it from and found out the car had been hit and the driver door got replaced, apparently with a door from a later W220.

There must be something in the replaced door that isn"t compatible, but what? So far I can' t find any electrical component that isn't compatible throughout the w220 range.

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2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire