Mercedes W176 A200 CDI OM651.930 170HP Engine Unit ECU Set A6519009502 Automatic

Mercedes W176 A200 CDI OM651.930 170HP Engine Unit ECU Set is a specialized electronic kit designed for vehicles equipped with a diesel engine and an automatic transmission. As a product from the Electronic control modules and ECUs category, it allows for the professional repair or replacement of the engine management system while maintaining the vehicle's factory operating logic.

Specifications and technical data

• SKU: A6519009502-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519009502
• Substitutable numbers: A6519009502, A 651 900 95 02, A6519010902, A 651 901 09 02, 28429192, A2469051402, A 246 905 14 02
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU set

The presented set is dedicated to the Mercedes A-Class W176 model in the A200 CDI version with the 170HP OM651.930 engine. The set is responsible for coordinating the operation of the diesel engine, including controlling fuel dosage, boost pressure, injection parameters, and communication with other electronic modules of the vehicle.

The version prepared for configuration with an automatic transmission ensures proper communication between the engine control unit and the transmission module, which translates into stable gear shifts, correct responses to load, and consistent operation of comfort and safety systems.

Benefits of using an original control module

Using an original electronic control module instead of a damaged component allows for the restoration of factory engine performance parameters without the need for interference with the vehicle's electrical installation. This solution is particularly beneficial in cases of starting problems, unstable idle, limp mode, or communication errors between the engine ECU and other modules.

The ECU set designed for a diesel engine paired with an automatic transmission minimizes the risk of software incompatibility, which is a common problem with randomly selected controllers. This helps reduce diagnostic time and speeds up the process of restoring the vehicle to full efficiency.

Application in a drivetrain with an automatic transmission

In vehicles with an automatic transmission, the engine ECU plays a key role in exchanging data with the transmission module. A correctly selected ECU set:

• supports smooth and predictable gear shifts under various loads,
• enables optimal use of the diesel engine's torque,
• helps maintain proper fuel consumption while preserving driving dynamics,
• ensures consistent operation of driver assistance systems.

For workshops specializing in the Mercedes brand, such a set is a practical solution for repairing vehicles after engine electronics failure or unsuccessful programming attempts.

Characteristics of the used product

The offered ECU set is a used component, which allows for an economical repair while maintaining the original electronic architecture of the vehicle. In practice, this means the possibility of matching the controller to a specific vehicle while adhering to the manufacturer's factory quality standards, at a lower cost than a new module.

Before installation, it is recommended to perform a full vehicle diagnostic and plan the appropriate adaptation and potential programming procedures, in accordance with the requirements of the specific Mercedes W176 A200 CDI unit.

Electronic control modules in Mercedes – expansion and selection

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 ECUs, comfort modules, or transmission controllers, check the available parts in the Mercedes electronic control modules and ECUs category.

For a comparison of solutions used in other brands and a better understanding of how engine ECUs and comfort modules work, you can read an article describing iDrive systems and electronic modules in BMW – 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.

If you are interested in a broader context of how the engine ECU works with different types of transmissions and want to better understand the specifics of automatic gearboxes, this guide may be helpful: Transmission: manual, automatic or DSG – typical faults and a guide to buying a used gearbox.