as 97SL320 said

you cannot swap out computers on this car (MB made it like this to prevent chop shops hacking these up)

you need the original ECU to make the engine start.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)