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MB W203 C-Class complete engine control unit 2711530591 Siemens 5WK90517 
Product information "MB W203 C-Class complete engine control unit 2711530591 Siemens 5WK90517 "
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: 271 153 05 91
Part number from Siemens: 5WK 90517  SIM4L KE ER
Please note the part number. Fits on some MB models.