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MB W203 C-Class complete engine control unit 2711539079 Siemens 5WK90506 
Product information "MB W203 C-Class complete engine control unit 2711539079 Siemens 5WK90506 "
For sale here is an original Mercedes Benz MB W203 C-Class engine control unit.
The engine control unit is in very good condition. Everything worked great until the expansion. It will be completely sold as seen in the picture. So control unit, key with ignition and the control unit itself. Chassis number is of course included.
All electrical functions are fully in order.
Part number of Mercedes Benz: 2711539079
Part number from Siemens: 5WK 90506 
Please note the part number. Fits on some MB models.