Mercedes W169 A170 266.940 116HP Engine Control Unit ECU A2661534079 Automatic

Mercedes W169 A170 266.940 116HP Engine Control Unit ECU Automatic is a specialized electronic engine control unit designed for a petrol engine paired with an automatic transmission. This component from the Electronic control modules and units category is responsible for precise engine management, ensuring stable power characteristics and proper cooperation with the drivetrain. Thanks to its factory design, this ECU is the right choice for professional repair or replacement of a faulty control unit in a Mercedes A-Class W169 series model.

Specifications and technical data

• SKU: A2661534079
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661534079
• Substitutable numbers: A2661534079, A 266 153 40 79, A0014460240, A 001 446 02 40, 5WK90925
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The presented engine control unit is designed to support the petrol powertrain in a Mercedes A-Class, in the version with an automatic transmission. The controller monitors key engine operating parameters, such as fuel dosage, ignition timing, and cooperation with auxiliary systems, which translates into stable operating culture and predictable throttle response. Using a dedicated ECU for a specific drivetrain configuration allows for maintaining compliance with the vehicle's factory characteristics.

Benefits of using an original ECU

Choosing an original electronic control module for a Mercedes provides a number of practical advantages in daily operation. The controller is factory-adjusted to the parameters of the engine and automatic transmission, which facilitates integration with the electrical installation and the vehicle's safety systems. This makes it possible to maintain consistency of software and communication within the entire electronic network of the car, without the need for compromise solutions.

In the case of replacing a faulty engine control unit, using the correct ECU helps reduce the risk of communication errors, starting problems, or improper operation of the automatic transmission. This is particularly important in modern vehicles, where the engine controller works with many other modules, creating a complex drivetrain management system.

Application in a petrol unit with an automatic transmission

This engine control unit is intended for configurations that use a petrol engine and an automatic transmission. This means that its operating map, control logic, and communication method with other modules are adapted to the characteristics of such a drivetrain. Proper matching of the fuel type and transmission type is crucial for the correct operation of functions such as gear shifting, load response, or cooperation with driver assistance systems.

Thanks to this, the controller can effectively manage engine operating parameters in various road conditions, from city driving to longer routes, maintaining the right balance between dynamics and fuel consumption. A properly selected ECU also limits the risk of diagnostic errors related to drivetrain configuration mismatch.

Professional replacement and matching of the control unit

When selecting an engine control unit for a Mercedes A-Class W169 series, it is important to pay attention to compatibility with the specific engine version and transmission type. In practice, this means the need to compare the OEM part number and any interchangeable numbers, as well as verifying the module's purpose in terms of fuel type and transmission type. This selection method helps avoid problems with adaptation and programming of the controller in the vehicle.

Due to the nature of this electronic component, it is recommended to entrust the installation of the ECU to a workshop with experience in working with Mercedes electronics, which will facilitate proper configuration and potential coding. A properly selected and correctly installed controller provides a solid foundation for further diagnostics and maintaining the efficiency of the drivetrain.

Mercedes electronic control modules and units – expansion and repair

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

More about choosing used electronics

When deciding to install a used engine control unit, it is worth familiarizing yourself with the principles of safe electronics selection and typical installation and diagnostic procedures. Practical tips on choosing used ECUs, as well as other electronic modules, can be found in the article A second life for electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which will help you better plan your repair and reduce the risk of incorrect part selection.