Mercedes W169 A150 W245 B150 Engine Control ECU Kit A2661538979 + Key Automatic

Mercedes W169 A150 W245 B150 Engine Control ECU Kit + Key Automatic is a set from the Electronic control modules and ECUs category, designed for Mercedes vehicles equipped with an automatic transmission. The set includes an engine control unit along with a matched key, which facilitates integration with the vehicle's existing electronic installation and speeds up the process of starting the powertrain after repair.

Specifications and technical data

• SKU: A2661538979-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661538979
• Substitutable numbers: A2661538979, A 266 153 89 79, A0024463140, A 002 446 31 40, 5WK90958, A1695452932, A 169 545 29 32, A1695451908, A 169 545 19 08
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented ECU kit is responsible for advanced engine management in the Mercedes W169 class, working in conjunction with the vehicle's power supply, ignition, and security systems. The integrated key is linked to the controller's electronics, which allows for maintaining system consistency of the immobilizer and reduces the need for additional programming compared to purchasing individual components.

By being dedicated to a vehicle with an automatic transmission, the module is adapted to exchange data with the transmission electronics, which is significant for smooth gear shifting, idle stability, and the correct operation of driving modes. Such matching reduces the risk of communication errors between the engine controller and other modules in the vehicle.

Benefits of using a complete controller with a key

Using a complete ECU kit with a key is particularly beneficial when replacing a damaged controller after an electronic failure, water damage, or communication issues within the vehicle's network. Having a paired key facilitates the work of an electrician or diagnostician, as some adaptation procedures can be simplified compared to a configuration based on randomly selected components.

The main advantages of this solution include:

• consistency of engine electronics and security systems,
• a better baseline for further programming and adaptation,
• reduction of time required for diagnostics after installation,
• increased chances of a trouble-free engine start after replacement.

For workshops specializing in the Mercedes brand, such a set is a practical service solution, allowing the vehicle to be returned to the road faster after major electronic faults.

Integration with automatic transmission

The controller in this offer is designed to work with an automatic transmission, which is important both for the correct operation of the drivetrain and for driving comfort. Proper communication between the ECU and the transmission module affects:

• selection of shift points depending on load and driving style,
• idle speed stability when in gear,
• vehicle response to accelerator pedal input,
• overall refinement of the drivetrain in urban and extra-urban driving.

Choosing a controller dedicated to the automatic version reduces the risk of software incompatibility, which is crucial in modern electronic installations where many modules exchange data in real-time.

Characteristics of the used product

The offered ECU kit with a key is a used item, which allows for a favorable compromise between repair cost and functionality. This type of solution is often chosen for vehicles that are several or more years old, where a full replacement with a brand-new controller is often economically unjustified.

Before installation, it is recommended to perform a full vehicle diagnostic and consult with an experienced automotive electrician who will select the appropriate programming and adaptation procedures for the specific car configuration. Proper preparation and installation are crucial for the stable operation of the entire electronic system.

More about electronics and selecting used controllers

If you want to better understand when choosing a used engine controller is justified and what to look for when selecting modules, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. You will find practical tips there regarding diagnostics, compatibility, and the safety of using used electronics.

Additionally, if you are considering different vehicle repair strategies and want to compare the advantages of new versus used parts in terms of cost and durability, the following article may be helpful: Car parts – new or used? We compare costs, quality, and durability. This is a good supplement to your knowledge when planning major service work.

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