Mercedes W169 W245 B170 M266.940 116HP Engine Control Unit Set A2661539679

Mercedes W169 W245 B170 M266.940 116HP Engine Control Unit Set is a complete, used set from the Electronic control modules and ECUs category, designed for petrol engines paired with an automatic transmission. This is a solution for users who want to restore the proper operation of the drivetrain while maintaining factory control logic and stable engine performance parameters.

Specifications and technical data

• SKU: A2661539679-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661539679
• Substitutable numbers: A2661539679, A 266 153 96 79, A0024463340, A 002 446 33 40, A0024463040, A 002 446 30 40, A1695452932, A 169 545 29 32, A1695451908, A 169 545 19 08
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit set

The presented engine control unit set is dedicated to Mercedes vehicles from the W169 and W245 families in the B170 version with the 116 HP M266.940 engine. The component is responsible for advanced management of the petrol engine's operation, including fuel injection control, ignition, and communication with the automatic transmission, which translates into smooth acceleration and predictable throttle response.

By maintaining the factory control architecture, the set allows for the consistency of all related electronic systems, such as safety and comfort systems, which is particularly important in modern Mercedes designs.

Benefits of using an original Mercedes module

Choosing an original module from dismantling is a solution that combines reasonable costs with high technical compatibility. Using a control unit from the same model family reduces the risk of communication issues within the vehicle network and minimizes the need for additional wiring modifications.

Key advantages of this solution include:

• maintaining the factory performance characteristics of the petrol engine,
• proper cooperation with the automatic transmission,
• consistency with other electronic modules in the vehicle,
• the ability to use existing wiring and connectors without interfering with the installation.

For workshops and individual users, this means shorter repair times and greater predictability of the final result after installation and adaptation of the control unit.

Application in the drivetrain and vehicle electronics

The control unit included in the set plays a central role in managing the drivetrain. Based on signals from sensors, it analyzes load, temperature, engine speed, and accelerator pedal position, and then selects the appropriate engine operating parameters. In the case of versions with an automatic transmission, this has a direct impact on gear shift quality and driving comfort.

As an item from the Electronic control modules and ECUs category, the set works with other modules in the vehicle network, which requires maintaining appropriate hardware and software compatibility. This is why using a dedicated solution for a specific engine and body version is so important from the point of view of reliability.

Practical installation and diagnostic tips

When replacing the engine control unit in compact-class Mercedes vehicles, it is worth paying attention to the correct identification of the engine version and the type of transmission. Using the appropriate set facilitates subsequent adaptation in the vehicle and limits the number of potential errors stored in the diagnostic system's memory.

It is recommended to perform a full scan of electronic systems after installation, followed by adaptation procedures in accordance with the manufacturer's guidelines. This allows for stable engine operation across the entire load range and ensures predictable vehicle behavior in daily use.

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.

More about the operation of control units and electronic modules

For those interested in a broader context of how engine control units and other electronic modules work in modern cars, including methods for their diagnostics and repair using parts from dismantling, the article dedicated to iDrive systems and control units in BMW vehicles may be helpful. Read the material: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using parts from dismantling?.