Mercedes W169 200CDI OM640.941 140 HP Engine Module ECU Kit A6401502579 Key Lock

Mercedes W169 200CDI OM640.941 140 HP Engine Module ECU Kit is a specialized control unit designed for OM640 diesel engines paired with a manual transmission. This component from the Electronic control modules and controllers category is responsible for precise engine management, ensuring stable performance and predictable vehicle behavior.

Specifications and technical data

• SKU: A6401502579-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6401502579
• Substitutable numbers: A6401502579, A 640 150 25 79, 0281012256, 0 281 012 256, A1695452932, A 169 545 29 32, A1695451508, A 169 545 15 08, KD
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the controller

The engine computer dedicated to the OM640 unit in the Mercedes W169 acts as the central module managing the powertrain. It analyzes sensor signals, controls fuel injection, auxiliary equipment operation, and manual transmission interaction to maintain proper dynamics, smooth operation, and fuel efficiency in the diesel engine.

A properly selected controller is crucial when replacing a damaged module, performing post-collision repairs, or restoring the full functionality of the injection system. Using the correct engine computer helps avoid issues with starting, rough engine idling, or errors stored in the diagnostic system memory.

Benefits of using an original Mercedes controller

Choosing a controller from the series used in factory-fitted Mercedes vehicles ensures the maintenance of parameters specified by the vehicle manufacturer. This means:

• proper compatibility with the OM640 diesel engine and engine accessories,
• compatibility with the manual transmission and its operating logic,
• stable injection maps and programmed engine protection strategies,
• easier diagnostics using factory service tools.

As a result, the engine computer can be used both for standard replacement of a damaged module and for more advanced engine control system repairs, where consistency of software and hardware is essential.

Application in a diesel engine with a manual transmission

The controller has been designed for use with a diesel engine and a manual transmission, which is important when selecting the right module for a specific vehicle configuration. In this combination, the engine computer is responsible for, among other things:

• coordinating torque with clutch and transmission operation,
• maintaining proper idle speed during gear changes,
• smooth response to accelerator pedal input,
• emission control under typical diesel engine operating conditions.

Selecting a controller compatible with the fuel-transmission configuration reduces the risk of improper engine operation and communication errors between modules.

Product characteristics and replacement numbers

The offered engine computer belongs to the Electronic control modules and controllers group and is a used part, which allows for economical vehicle repair while maintaining original specifications. The module has an assigned OEM part number and a set of interchangeable numbers, allowing it to be precisely matched to a specific version of the Mercedes W169 with an OM640 engine.

Before purchasing, it is recommended to compare the markings with the currently installed controller or verify compatibility using numbers in the service documentation. This facilitates the selection of the correct module and minimizes the risk of problems during vehicle adaptation.

Support in selection and additional information

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, management modules, or ECU units, check the available parts in the Mercedes electronic control modules and controllers category.

When working with advanced vehicle electronics, it is worth paying attention to the quality and origin of the components. You can read about how original modules affect the character and handling of a car in the article Audi and emotions in their purest form – how used modules and controllers help maintain the brand's DNA, which shows the importance of properly selected electronic components in modern cars.

When planning broader service work, especially before a season with more difficult operating conditions, the guide Winter essentials – which used powertrain and electronic components should be checked before the frost, containing practical checklists and tips on verifying key components, may also be helpful.