Mercedes W204 C250 CDI BlueEFFICIENCY OM651.911 Engine ECU A6519007500 Automatic

Mercedes W204 C220CDI Engine Control Unit Automatic Transmission A6519007500 is a factory electronic control module designed for diesel engines with automatic transmissions. This item from the Electronic Control Units and Controllers category is responsible for precise management of engine operation, fuel injection, and cooperation with the automatic gearbox. By using an original control unit, stable performance characteristics of the powertrain and correct communication with the vehicle's other electronics are maintained.

Specifications and technical data

• SKU: A6519007500-4
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519007500
• Substitutable numbers: A6519007500, A 651 900 75 00, A0064461540, A 006 446 15 40
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Function of the Engine Control Unit

The engine control unit in the Mercedes W204 C220CDI model plays a key role in managing the operating parameters of the diesel engine. It is responsible for:

• controlling the amount and timing of fuel injection in Diesel engines,
• coordinating operation with the automatic transmission,
• handling sensors and actuators related to the powertrain,
• communicating with other vehicle modules via the data bus.

With a properly selected control unit, software and hardware consistency is maintained, which translates to predictable vehicle behavior under various operating conditions.

Selection by OEM Number and Interchange Numbers

The presented control unit belongs to a group of components with a specific OEM part number and has assigned interchangeable numbers, which facilitates matching to a particular vehicle. When selecting a module, it is recommended to verify compatibility by:

• original part number (OEM),
• reference (interchangeable) numbers,
• fuel type and transmission type.

This approach minimizes the risk of hardware and software compatibility issues and reduces the need for additional programming beyond standard vehicle adaptation.

Technical Characteristics and Vehicle Integration

As an element from the Electronic Control Units and Controllers category, the control unit is designed to operate in the demanding environment of the engine bay. The module's design considers:

• resistance to typical thermal and vibration loads encountered in the engine bay,
• stable operation with the vehicle's electrical system,
• integration with Mercedes' factory software for diesel engines with automatic transmissions.

Proper matching of the control unit to the specific drivetrain configuration (Diesel engine + automatic transmission) is crucial for the correct functioning of features such as gear shifting, torque control, and driver assistance systems.

Condition, Origin, and Practical Application

The offered module is a used part, sourced from dismantling, which allows for an economical replacement of a damaged control unit while maintaining the original manufacturer's specifications. In practice, this means the possibility of:

• restoring correct engine operation after an electronic failure,
• eliminating errors related to ECU communication with other modules,
• maintaining the factory operating parameters of the powertrain.

Before installation, a standard diagnostic procedure is recommended, and if necessary, adaptation or programming of the control unit according to service guidelines for the specific model.

Technical Support and Additional Information

If you are considering using a used ECU module in your car and want to better understand issues related to OEM number selection, hardware compatibility, and installation procedures, check out our guide: used automotive electronics – second-hand ECU modules and sensors. There you will find practical tips on diagnostics, programming, and frequently asked questions related to salvaged electronics.

If you are looking for other Electronic Control Units and Controllers dedicated to the Mercedes brand, take advantage of our offer and go to the category: Mercedes Electronic Control Units and Controllers. This will allow you to easily compare available solutions and select the right part for your vehicle.