Are we talking about the Engine Control Unit, or the generic Electronic Control Unit (transmission, ESP, etc.)? If we're talking about the engine control unit, the car won't start if it's got a "borrowed" ECU. All of the others, except possibly SRS, should work. It's always a good idea to check part numbers for compatability before swapping ECU's though.

Thanks!

Does a new one from Mercedes need to be programmed in the vehicle or can it be done with the VIN before I install it?

Thanks

Exactly which control unit are you referring to??? Some are plug-and-play, some need to be programmed!!!

Even if the part numbers are identical, according to M.B. DOC a "borrowed" ECU is still "Useless in any car except the original that it is 'married' to."

Does that apply for new ECU? If yes dead ECU means death of the car?

It's not clear to me.

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE