Mercedes W169 A170 M166.940 116HP Engine Unit Module ECU A2661536679 Automatic

Mercedes W169 A170 M166.940 116HP Engine Unit Module ECU Automatic is a specialized, used control module designed for a diesel unit paired with an automatic transmission. This component from the Electronic control modules and controllers category is responsible for precise engine management, ensuring stable parameters and proper communication with other vehicle systems. It is a solution for users looking for a technically matched ECU controller for a specific drivetrain configuration.

Specifications and technical data

• SKU: A2661536679-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661536679
• Substitutable numbers: A2661536679, A 266 153 66 79, A0014460240, A 001 446 02 40, 5WK90941
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and role of the engine control unit

The presented engine control unit (ECU) is designed to work with a diesel engine and an automatic transmission in the Mercedes A-Class W169 series. The controller manages key engine operating parameters, such as fuel dosing, ignition control in a diesel engine, auxiliary equipment operation, and data exchange with other vehicle modules. This ensures that the drivetrain maintains proper performance, smooth operation, and predictable responses to driver inputs.

Benefits of using a dedicated ECU

Using the correct engine control unit in this drivetrain configuration allows for maintaining the consistency of the entire control system. The module is prepared to work with an automatic transmission, which is crucial for smooth gear shifting and the proper functioning of comfort-related features. For the user, this means:

• maintaining the proper operating characteristics of the diesel engine,
• correct communication with the automatic transmission module,
• stable operation of systems dependent on the engine controller.

Choosing such a component is particularly important for repairs where matching the controller to a specific fuel type and transmission type is required.

Application in a diesel drivetrain with an automatic transmission

This engine control unit is intended for use in a system where a diesel-powered engine works with an automatic transmission. Such a configuration requires consistent control of torque, engine load, and synchronization with gear-shifting logic. A properly selected ECU supports:

• smooth gear shifting without unwanted jerking,
• maintaining stable idle speed,
• optimization of fuel consumption under typical operating conditions.

Thanks to this, the vehicle maintains predictable behavior both in city traffic and during extra-urban driving.

Characteristics of the used product

The offered module belongs to the group of used parts, meaning it comes from disassembly and was previously operated in a vehicle. Such components are often chosen for repairs where maintaining the original electronic architecture of the vehicle while controlling costs is important. A used engine control unit can be a beneficial solution in situations where a new part is difficult to obtain or economically unjustified.

Related components and categories

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as controllers, engine management modules, or auxiliary control systems, check the available parts in the Mercedes electronic control modules and controllers category.

Substantive support and knowledge about used parts

When selecting used electronic components, such as an engine control unit, it is worth knowing the general principles regarding compatibility and repair cost-effectiveness. Additional information on how used components can affect the character and behavior of a vehicle is provided in our blog article: Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?. Although the description concerns a different brand, it addresses universal issues related to the use of original, used components in modern cars.