Mercedes W204 W212 C220CDI 170HP OM651.911 Engine Control ECU A6519007500 Manual

Mercedes W204 W212 C220CDI 170HP OM651.911 Engine Control ECU is a specialized component from the Electronic control modules and ECUs group, designed for the diesel powertrain in C-Class and E-Class models. It is responsible for the precise management of the 170 HP C220 CDI unit, ensuring stable engine performance, correct fuel injection quantities, and proper interaction with auxiliary equipment. This solution is dedicated to users expecting proven, factory-standard engine control in Mercedes vehicles.

Specifications and technical data

• SKU: A6519007500-26
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519007500
• Substitutable numbers: A6519007500, A 651 900 75 00, A0064461540, A 006 446 15 40, 28312735
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The presented engine computer is designed to work with the C220 CDI diesel unit in W204 and W212 bodies. As a component from the Electronic control modules and ECUs category, it is responsible for coordinating injection, turbocharging, auxiliary systems, and communication with other vehicle modules via the data bus.

The ECU supports a diesel-powered engine, which means the injection maps and operating strategies are adapted to the characteristics of the diesel unit. It has been configured to work with a manual transmission, ensuring that torque control logic and throttle response are matched to manual gear shifting.

Benefits of using an original Mercedes module

Using a factory engine computer in a Mercedes W204 or W212 allows for maintaining the consistency of the entire vehicle's electronic system. The software and hardware are prepared to work with the wiring, sensors, and other modules, which reduces the risk of communication errors and diagnostic issues.

Key advantages include:

• maintaining factory operating parameters of the 170 HP C220 CDI unit,
• proper compatibility with manual transmissions,
• integration with safety and comfort systems,
• easier diagnostics using service testers.

For workshops and users, this means a more predictable installation process and a lower risk of problems after replacing the ECU.

Application in diesel powertrains with manual transmission

Diesel engines require precise control of fuel dosage, boost pressure, and auxiliary equipment operation, which is why a properly selected engine computer has a direct impact on performance, fuel consumption, and dynamics. In combination with a manual transmission, the ECU is responsible for:

• torque control depending on the selected gear,
• smooth power delivery across the entire rev range,
• cooperation with driver assistance systems,
• recording data required for diagnostics and service.

Selecting a module compatible with the diesel fuel type and manual transmission is crucial to avoid improper engine operation, control errors, and adaptation problems.

Product characteristics and practical application

The offered ECU belongs to a group of solutions intended for Mercedes vehicles, which ensures structural compatibility with the electrical installation and the vehicle's network architecture. As a used component, it comes from dismantling, which in practice allows for cost-effective engine control system repair while maintaining factory specifications.

In practice, the module will work well both when replacing a damaged computer and during professional powertrain repairs in specialized service centers. Thanks to the preservation of the original control architecture, it is possible to use standard adaptation and coding procedures applied in Mercedes C-Class and E-Class vehicles.

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 controllers, engine management modules, or electronic auxiliary systems, check out the available parts in the Electronic control modules and ECUs Mercedes category.

Technical support and knowledge about electronic modules

When working with engine computers and other electronic modules, it is worth using proven service procedures, appropriate diagnostics, and experience in ECU programming. To expand your knowledge about the operation of advanced electronic systems, their repair, and the use of parts from dismantling in modern cars, an article describing a practical approach to control modules in premium vehicles may be helpful – you can find it here: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models.

Additionally, if you are interested in the broader context of powertrain operation and the interaction of electronics with drivetrain systems in premium cars, it is worth reading a comparison of AWD solutions from different manufacturers: xDrive, 4Matic, quattro or 4Motion – a comparison of AWD drives from BMW, Mercedes, Audi and VW brands.