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Mercedes Benz W203 control unit engine control unit 2711531679 Siemens 5WK90448 
Product information "Mercedes Benz W203 control unit engine control unit 2711531679 Siemens 5WK90448 "
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.
All electrical functions are fully in order.
Part number of Mercedes Benz: A2711531679
Part number from Siemens: 5WK90448
Please note the part number. Fits some Mercedes Benz models.