Mercedes W169 A150 M266 95HP Engine Control Unit ECU A2661530391 Automatic

Mercedes W169 A150 M266 95HP Engine Control Unit ECU is a specialized electronic module designed for vehicles with an automatic transmission. As a component from the Electronic control modules and ECUs group, it is responsible for precise management of the powertrain, ensuring stable power characteristics and proper cooperation with the drivetrain.

Specifications and technical data

• SKU: A2661530391
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661530391
• Substitutable numbers: A2661530391, A 266 153 03 91, A0024463140, A 002 446 31 40, 5WK90974
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU

The presented ECU is dedicated to the Mercedes A-Class W169 A150 with the M266 95 HP engine, equipped with an automatic transmission. The ECU module manages key engine operating parameters, such as fuel injection, ignition timing, and adaptive corrections, which translates into smooth acceleration, predictable throttle response, and stable idle operation.

Thanks to its factory architecture, the ECU works with other vehicle systems, such as safety systems or comfort electronics, maintaining communication consistency within the vehicle network and reducing the risk of diagnostic errors.

Compatibility and replacement numbers

The module belongs to the group of original solutions used by Mercedes and has an assigned OEM part number and a set of interchangeable numbers. The presence of reference numbers facilitates the selection of the appropriate ECU for a specific vehicle configuration, especially when comparing components from different model years or equipment versions.

Before purchasing, it is recommended to compare the markings with the currently installed ECU and verify compatibility with the specific M266 engine version and the automatic transmission used. This approach minimizes the risk of vehicle starting issues or the need for additional programming beyond standard adaptation.

Operating characteristics with an automatic transmission

The ECU has been configured to work with an automatic transmission, which means its logic takes into account signals from the gear shift system, selector position, and drivetrain load. This allows for smooth adjustment of engine torque to the currently selected gear, improving driving comfort in city traffic and on the road.

An ECU properly matched to an automatic version also supports the correct operation of functions such as downshifting under load, smooth starting, or stable speed maintenance during minor load changes, which is important for both the durability of the transmission and the overall refinement of the powertrain.

Condition, origin, and installation recommendations

The offered ECU is a used component, sourced from a dismantled Mercedes vehicle. Such modules, when properly selected and installed, represent a cost-effective solution, allowing for the restoration of full engine control system functionality without the need to invest in a new component.

For installation, it is recommended to use the services of a workshop experienced in working with Mercedes electronics, including the coding and adaptation of engine control units. Proper connection, potential software matching, and verification of diagnostic errors after installation are crucial for trouble-free operation.

Expansion of the control system in a Mercedes

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 additional controllers, powertrain management modules, or electronic controllers working with the ECU, check out the available parts in the Mercedes electronic control modules and ECUs category.

To better assess when choosing a used engine ECU is justified and how to safely select such an element for your car, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine ECUs, comfort modules, and parking sensors?