Mercedes W205 C220d 651.921 170HP BlueTEC Engine ECU Kit A6519000603 Key SAM

Mercedes W205 C220d 651.921 170HP BlueTEC Engine ECU Kit is a specialized electronic control unit designed for diesel engines paired with an automatic transmission. This component from the Electronic control modules and ECUs category is responsible for precise engine management, combustion parameters, and communication with other vehicle systems. Thanks to its factory design, the ECU maintains full integration with the electrical architecture of the Mercedes C-Class W205.

Specifications and technical data

• SKU: A6519004500-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519004500
• Substitutable numbers: A6519004500, A 651 900 45 00, A6519014000, A 651 901 40 00, A2059003913, A 205 900 39 13, A2059008010, A 205 900 80 10
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The presented engine control unit is dedicated to the BlueTEC diesel powertrain, which involves integration with advanced exhaust gas treatment systems. The controller manages, among other things, fuel dosing, boost pressure, fuel injection operation, and communication with the automatic transmission, ensuring smooth gear shifts and stable torque characteristics. As a result, the engine maintains proper dynamics, smooth operation, and compliance with emission standards.

Benefits of using an original ECU module

Using an original control unit in a Mercedes W205 C220d allows for maintaining consistency in software and operating parameters according to the manufacturer's factory specifications. This solution is particularly important in vehicles with automatic transmissions, where precise ECU cooperation with the transmission module affects gear shifting smoothness, throttle response, and driving comfort. Choosing a used, fully functional module from the same family allows for cost-effective repairs without compromising factory control logic.

Integration with vehicle installation and systems

The engine control unit from this series is designed to operate within the extensive network of Mercedes C-Class W205 controllers. It is responsible for data exchange with other body and powertrain modules, which is significant for safety systems, traction control, and comfort functions. When selecting a controller, it is crucial to match it by the OEM part number and interchangeable numbers to ensure full hardware and software compatibility with the specific vehicle configuration.

Operational characteristics and service application

This type of ECU is often used in professional powertrain repairs when the existing controller has suffered electronic or software damage. A used module with the correct reference allows for restoring proper engine operation after performing the necessary adaptation and coding procedures in the vehicle. For workshops specializing in the Mercedes brand, this is a practical solution that combines cost control with the preservation of the factory control architecture.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as engine controllers, ECU modules, or other electronic control units, check the available parts in the Mercedes electronic control modules and ECUs category.

Technical support and knowledge of automotive electronics

When working with ECU modules and other controllers, it is worth using up-to-date knowledge regarding OEM number matching, coding procedures, and post-installation tests. Practical tips on selecting and installing used electronics, including engine controllers, can be found in the Global Parts guide: used automotive electronics – why it is worth choosing second-hand ECU modules and sensors. Additionally, if you are interested in the broader context of control module operation in modern premium cars, you can read an article describing the servicing of iDrive systems and controllers in BMW: how to take care of electronic modules and engine controllers in premium cars.