Mercedes W169 W245 M266.920 95HP Engine Control ECU Kit A2661539779 Manual

Mercedes W169 W245 M266.920 95HP Engine Control ECU Kit Manual is a specialized, factory-original module from the Electronic control modules and ECUs category, designed for use with a petrol engine and a manual transmission. It is responsible for precise engine management, ensuring stable parameters, correct communication with the vehicle's electrical system, and proper integration with the electrical architecture of Mercedes A-Class and B-Class models.

Specifications and technical data

• SKU: A2661539779-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661539779
• Substitutable numbers: A2661539779, A 266 153 97 79, A0024463140, A 002 446 31 40, 5WK90966, A1695452932, A 169 545 29 32, A1695451908, A 169 545 19 08
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU

This engine control unit has been designed to work with the 95 HP M266.920 petrol engine used in Mercedes W169 and W245 models. As a central component of the powertrain management system, the module coordinates fuel injection, ignition, and communication with other electronic systems in the vehicle, which translates into predictable throttle response and consistent performance in daily operation.

Thanks to being dedicated to a manual transmission, the ECU is optimized for the characteristics of a manual gearbox, which promotes smooth gear shifting and stable engine speeds across the entire operating range.

Benefits of using an original module

Using an original engine control unit in a Mercedes W169 or W245 series vehicle allows you to maintain consistency with the factory vehicle configuration. The module is adapted to the specific electrical architecture, which facilitates integration with the wiring, reduces the risk of communication errors, and supports proper cooperation with other onboard systems.

Compared to universal replacements, this component provides:

• better compatibility with the software and equipment configuration of the specific model,
• stable operation in typical urban and extra-urban conditions,
• greater predictability of powertrain response after installation.

This solution is particularly recommended for repairs where maintaining compliance with factory engine operating parameters and vehicle network communication is crucial.

Technical characteristics in the context of operation

The ECU has been developed with the petrol engine in mind, which means that ignition maps and control strategies are matched to the characteristics of the M266.920 unit. In combination with a manual transmission, this allows for predictable vehicle behavior during starting, downshifting, and dynamic acceleration, without the need to adapt solutions from other powertrain versions.

The module belongs to the Electronic control modules and ECUs group, meaning it interacts with other controllers in the vehicle via communication buses. A correctly selected component of this type reduces the occurrence of diagnostic errors related to configuration mismatches and facilitates subsequent maintenance, including computer diagnostics.

Condition, selection, and installation

The offered ECU is a used part, which in workshop practice often represents a cost-effective solution while maintaining compliance with factory specifications. Before installation, it is recommended to verify compatibility with the vehicle using the part number and the engine/transmission configuration, as well as to prepare for potential adaptation or programming in accordance with Mercedes service procedures.

With proper selection and installation, such a module can effectively restore the correct operation of the powertrain after the failure of the previous ECU, without the need for mechanical engine intervention. This is particularly important in the case of typical electronic faults, where replacing the module alone allows for the quick restoration of vehicle functionality.

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

For a broader understanding of how engine ECUs work, manufacturer strategies, and the practice of using salvaged modules in modern cars, it is worth reading the article on our blog: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using salvaged parts?. Although it concerns a different brand, it well illustrates the approach to diagnostics and the selection of used electronic modules.