Mercedes W169 A170 266.940 116HP Engine Unit Module ECU A2661536679 Key Lock

Mercedes W169 A170 266.940 116HP Engine Unit Module ECU Key Lock is an advanced component from the Electronic control modules and controllers category, designed to work with the powertrain in Mercedes vehicles. It enables precise management of the engine's operation and integration with the locking system, ensuring the consistency of the vehicle's electronics. This is a solution for users who expect stable powertrain performance and compliance with the factory electrical architecture.

Specifications and technical data

• SKU: A2661536679-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661536679
• Substitutable numbers: A2661536679, A 266 153 66 79, A0014460240, A 001 446 02 40, 5WK90941, A1695452923, A 169 545 29 23, A1695451108, A 169 545 11 08
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function in the vehicle

The presented ECU module with the steering lock and ignition switch assembly is designed to control engine operating parameters in Mercedes A-Class W169 models with a petrol engine. It is responsible for processing signals from sensors, monitoring fuel injection, controlling engine accessories, and communicating with other controllers in the vehicle. As a result, the powertrain maintains stable performance, and the response to driver commands remains predictable and repeatable.

Benefits of using an original ECU module

Using an original electronic control module in a Mercedes allows for maintaining consistency with the vehicle's factory configuration. The controller is prepared to work with a manual transmission and the engine, which minimizes the risk of communication errors in the CAN network and software matching issues. For the user, this means:

• maintaining engine performance characteristics in accordance with the manufacturer's specifications,
• proper cooperation with safety and comfort systems,
• easier diagnostics using factory service tools.

Condition, fitment, and installation aspects

The item comes from a used vehicle, which allows for an economical repair of the engine control system while maintaining the original specification. The module is intended for installation in place of the factory controller, using the existing wiring harness and factory mounting points. When selecting parts, it is crucial to compare the OEM number and interchangeable numbers to ensure full compatibility with the specific engine version and equipment.

Due to the connection with the immobilizer and the locking system, installation should be performed by a workshop with experience in automotive electronics, with access to appropriate diagnostic tools. This allows for proper adaptation of the module in the vehicle and avoids problems with starting the engine.

Application in the powertrain with a manual transmission

The module is designed to work with the engine and a manual transmission, which is significant for the logic of torque control, idle operation, and response to load changes. Proper matching of the controller to the fuel type and transmission type affects:

• smoothness of acceleration and downshifting,
• stability of RPM under various load conditions,
• proper operation of driver assistance systems that depend on data from the ECU.

For the user, this means more predictable vehicle behavior in daily operation and a lower risk of errors associated with an incorrectly selected controller.

Mercedes electronic control modules and controllers – expansion and service

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 engine controllers, comfort modules, or safety system management units, check the available parts in the Mercedes electronic control modules and controllers category.

Expert support and selection of used components

When choosing a used engine controller, it is worth relying on proven selection procedures based on the OEM number and reference numbers, as well as considering the fuel type and transmission type. Expert materials describing how to safely use the second-hand parts market, how to evaluate the cost-effectiveness of repairs, and what data is crucial when verifying compatibility can be helpful. In the broader context of maintaining the character of premium brands and the quality of onboard electronics, it is worth reading the article Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?, which shows the importance of original modules and components in modern cars.