Mercedes W251 R320 CDI OM642 4Matic Engine Unit ECU KIT A6519002803 Key Lock

The Mercedes W251 R320 CDI OM642 4Matic Engine Control Module ECU KIT Key is a complete engine control set designed for Mercedes vehicles with the OM642 engine and 4Matic drive. The kit includes the electronic engine control module along with components necessary for cooperation with the immobilizer system and the key, which facilitates restoring vehicle functionality after an electronic failure. This solution is particularly beneficial for professional repairs where component consistency and stable powertrain operation are crucial.

Specifications and technical data

• SKU: A6519002803
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519002803
• Substitutable numbers: A6519002803, A 651 900 28 03, 0281031244, 0 281 031 244, A4479007506, A 447 900 75 06, A4479004505, A 447 900 45 05
• Category: ECUs & Computer Modules

Purpose and Function of the ECU Kit

The presented ECU kit is dedicated to Mercedes R-Class W251 models with the OM642 diesel engine and 4Matic drive. Its purpose is to precisely control the engine's operation, including fuel delivery, boost control, accessory operation, and communication with other vehicle systems. Using a complete engine module with key helps reduce immobilizer matching issues and speeds up the vehicle startup process after electronic replacement.

Benefits of Using a Complete ECU KIT

The ECU kit with key offers a range of practical advantages in workshop diagnostics and repairs:

• consistency between engine control elements and vehicle security systems,
• reduced need for lengthy, from-scratch programming,
• easier integration with the electrical system of a specific model,
• efficient replacement of a damaged control unit in vehicles with electronic failures.

For workshops specializing in the Mercedes brand, such a complete ECU set is a convenient solution for repairs after flooding, electrical shorts, or mechanical damage to the control unit.

Professional Application and Selection by OEM/VIN

To correctly select this part for a specific vehicle, it is crucial to verify compatibility using the OEM number, interchangeable numbers, and VIN data. Proper hardware and software matching directly impacts engine stability, correct communication with other modules, and the absence of CAN network errors. A detailed discussion on selecting used control units, verifying compatibility, and common workshop questions can be found in the guide: used automotive electronics – how to safely select an ECU module and sensors by VIN and OEM.

Category Characteristics and Vehicle Integration

This product belongs to the group of Electronic Control Modules and Units, which are responsible for managing key vehicle functions. For the OM642 engine, the engine control unit works with the injection system, the 4Matic drive system, and safety and comfort systems. A correctly selected and configured module allows for maintaining factory engine operating parameters and facilitates subsequent computer diagnostics using service testers.

Condition, Verification, and Practical Application

The offered set is from the used parts segment, which significantly reduces repair costs compared to new components while maintaining the functionality required for daily operation. This type of solution is particularly attractive for older vehicles where investing in new control units may not be economically justified. If you want to learn more about the advantages of using used modules in vehicle electronics repairs, check out the article: why consider used ECU modules and other electronic components for Mercedes repairs.

Summary

The Mercedes W251 R320 CDI OM642 4Matic Engine Control Module ECU KIT Key is a practical solution for workshops and owners who need a complete engine control set tailored to a specific vehicle configuration. Using a ready-made kit with the key simplifies the installation process, reduces the risk of immobilizer issues, and allows for the efficient restoration of full powertrain functionality in Mercedes vehicles with the OM642 engine and 4Matic drive.