Mercedes W169 A180 M266.940 116HP Engine ECU Kit A2661531491 Key Lock Automatic

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W169 A180 M266.940 116HP Engine ECU Kit is a specialized module from the Electronic control modules and ECUs category, designed for precise management of the powertrain. It is responsible for controlling combustion parameters, coordinating with engine accessories, and integrating with other vehicle systems, which translates into stable, predictable, and safe vehicle operation.

Specifications and technical data

• SKU: A2661531491-5
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661531491
• Substitutable numbers: A2661531491, A 266 153 14 91, A0034466040, A 003 446 60 40, 5WK90990, A1699051500, A 169 905 15 00
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU

The presented control unit is dedicated to the gasoline engine in the Mercedes A-Class W169 series, A180 version, with the M266.940 116HP unit, paired with an automatic transmission. The module manages, among other things, fuel injection, ignition, auxiliary system operation, and communication with other vehicle controllers, ensuring cohesive operation of the entire powertrain.

Thanks to its factory architecture and appropriate software, the ECU is matched to the characteristics of this specific engine and transmission configuration, which allows for maintaining original performance, smooth operation, and safety strategies intended by the manufacturer.

Benefits of using an original module

Using an original engine ECU in a Mercedes W169 A180 allows for maintaining compliance with factory powertrain operating parameters. This is particularly important when:

• resolving starting issues or unstable idle,
• restoring proper engine cooperation with the automatic transmission,
• eliminating communication errors between electronic modules,
• performing diagnostics and repairs after damage to the wiring or engine accessories.

A properly selected ECU helps reduce the risk of incompatibility, which often occurs when using random replacements or components with different software specifications.

Technical characteristics and vehicle integration

The engine ECU from this series has been designed for operation in gasoline systems and for cooperation with an automatic transmission, which is significant for gear shift logic, load response, and powertrain protection strategies. The module communicates with other vehicle controllers via a data bus, allowing it to send and receive information necessary for the proper functioning of safety and comfort systems.

In practice, this means that after proper matching and configuration (including potential programming or adaptation in the vehicle), it is possible to restore factory engine settings without the need for interfering with the electrical harness or using additional adapters.

Application in service and repairs

This type of ECU is frequently used in professional workshops specializing in automotive electronics and Mercedes powertrain repairs. It is suitable both for standard replacement of a damaged module and in more complex cases, such as repairs after flooding, electrical shorts, or CAN communication issues.

Combined with appropriate computer diagnostics, it enables the effective restoration of full powertrain functionality, which is crucial for driving safety and maintaining predictable vehicle responses to driver inputs.

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, management modules, or control systems, check out the available parts in the Electronic control modules and ECUs Mercedes category.

More about the role of original modules in modern cars

Modern cars, regardless of the brand, rely heavily on advanced controllers responsible for maintaining the vehicle's character and consistent driving parameters. If you are interested in how original modules and components affect vehicle behavior and why it is worth choosing proven used parts, read the article: Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?.