Mercedes W169 200CDI OM640.941 140HP Engine Control Unit Module ECU A6401502579

Mercedes W169 200CDI OM640.941 140HP Engine Computer ECU A6401502579 is a specialized, factory control module designed for the diesel engine in the A-Class model. This electronic control unit from the Electronic Control Modules and Controllers group is responsible for precise engine management, ensuring stable power characteristics and proper operation with auxiliary equipment. A used ECU controller is a sensible choice for professional drivetrain repairs when you want to maintain the vehicle's original electrical architecture.

Specifications and technical data

• SKU: A6401502579
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6401502579
• Substitutable numbers: A6401502579, A 640 150 25 79, 0281012256, 0 281 012 256
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

ECU Controller Purpose and Function

The presented engine computer is dedicated to the diesel engine in the Mercedes A-Class W169 generation with the OM640.941 engine producing 140 HP. As the central element of the engine management system, the ECU analyzes signals from sensors and controls actuators such as injectors, regulating valves, and the turbocharging system. This allows for maintaining appropriate combustion parameters, smooth dynamics, and correct interaction with other vehicle systems.

The controller is designed to work with diesel engines, meaning it has tailored injection maps, boost pressure, and startup strategies typical for Diesel engines. Additionally, the module's design accounts for integration with a drivetrain based on a manual transmission, which is important for torque control logic and driver assistance functions.

Benefits of Using an Original Control Module

Choosing an original engine computer for the Mercedes W169 allows for maintaining software and hardware consistency throughout the vehicle. The factory ECU architecture facilitates integration with the electrical system, immobilizer system, and other comfort and safety modules. This is particularly important for modern diesel engines where communication between controllers occurs over digital buses.

A used module from the same hardware and software family also offers real savings compared to purchasing a new unit, while maintaining high quality of workmanship. An appropriately selected controller minimizes the risk of compatibility issues, communication errors, or incorrect engine operation after installation and adaptation.

Selection, Compatibility, and Practical Application

For the engine computer to function correctly, it is crucial to match it to the specific vehicle configuration – OM640.941 engine, 140 HP power version, fuel type, and transmission type. In practice, this means verifying compatibility by OEM number, interchangeable numbers, and vehicle data (VIN). A correctly selected module allows for:

• maintaining correct injection and boost maps for the diesel engine,
• proper cooperation with the manual transmission,
• seamless communication with other controllers in the vehicle.

In many cases, after installation, adaptation procedures or programming are required for the ECU to be correctly paired with the immobilizer and the specific car's equipment. Therefore, when planning a replacement, it is advisable to consider the support of a workshop with appropriate diagnostic equipment.

Condition, Inspection, and Use in Repairs

The offered engine computer is from the aftermarket and is intended for reinstallation in a vehicle after appropriate selection and potential programming. Used Electronic Control Modules and Controllers of this type are frequently used in professional automotive electronics repair services, especially for failures related to damaged original ECUs, communication errors, or starting problems.

Replacing the controller with an original module from the same family is often the most effective solution when repairing damaged electronics is uneconomical or unstable in the long term. This allows for restoring the correct operation of the diesel engine and maintaining the vehicle's factory performance parameters.

Technical Support 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 glow plug controllers, fan control modules, or additional control units, check the available parts in the Mercedes Electronic Control Modules and Controllers category.

When selecting a used ECU, correct matching by numbers and vehicle configuration is particularly important. To better understand the principles of selecting, programming, and installing such components, it is worth reading the Global Parts guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECU Modules and Sensors?. You will find practical tips on compatibility, selection by VIN/OEM, and common questions related to engine controller installation.