Mercedes W169 W245 A180 B180 CDI OM640.940 109HP Engine ECU Kit A6401508079 Keys

Mercedes W169 W245 A180 B180 CDI OM640.940 109HP Engine ECU Kit Keys is a complete electronic set designed for the powertrain of A-Class W169 and B-Class W245 models with the OM640.940 diesel engine. It includes the engine control unit along with matched immobilizer components and keys, which facilitates restoring the proper operation of the powertrain after an electronic failure. Thanks to the consistency of the components, the set allows for an efficient, technically correct replacement without the need for time-consuming programming from scratch.

Specifications and technical data

• SKU: A6401508079
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6401508079
• Substitutable numbers: A6401508079, A 640 150 80 79, 0281013030, 0 281 013 030, A1695451708, A 169 545 17 08, A1695452932, A 169 545 29 32
• Category: ECUs & Computer Modules

Application and compatibility

The presented engine control unit set is intended for Mercedes A-Class W169 A180 CDI and Mercedes B-Class W245 B180 CDI vehicles with the 109 HP OM640.940 unit. Integrating the ECU with the keys and modules that work with the immobilizer allows for maintaining compatibility with the vehicle's factory electronic architecture, which is particularly important in the case of modern security systems.

Characteristics of the ECU set with keys

The set belongs to the Electronic control modules and ECUs group, which means it is responsible for managing engine operation, communication with other modules in the vehicle, and start authorization. Combining the ECU with matched keys minimizes the risk of software conflicts and transponder recognition problems, which often occur when installing individual, unrelated components.

In practice, such a set is particularly useful when the original ECU has been damaged, or there are issues with the immobilizer or failed programming attempts. Using a ready-made, consistent set allows for shortening the diagnostic and installation time, as well as reducing the number of potential points of failure in the electronic system.

Benefits of using a used ECU set

Choosing a used engine control unit set with keys is a solution that allows for significantly reducing repair costs while maintaining compliance with the factory specification. The original control module ensures proper cooperation with the electrical system, sensors, and engine accessories, which translates into stable engine operation and correct performance parameters.

Before installation, it is recommended to verify the software compatibility and configuration with the equipment of the specific vehicle to avoid communication errors in the CAN network and improper operation of additional functions. It is also good practice to perform computer diagnostics after installation to confirm the correct identification of all modules.

Professional installation and good service practices

Due to the complexity of electronic systems in modern Mercedes vehicles, it is worth entrusting the installation of the ECU set with keys to a workshop with experience in working with the electronics of this brand. Correct coding and adaptation are crucial for trouble-free starting, operation of safety systems, and communication with other control units in the vehicle.

During installation, pay attention to:

• correct connection of electrical harnesses and ECU connectors,
• condition of the ground and power supply installation,
• verification of errors stored in the ECU memory after the first start-up,
• checking the operation of the central locking and functions related to the keys.

More about used electronics and related parts

If you want to make an informed decision on when it is worth choosing a used engine control unit, comfort module, or parking sensors, check out our guide: The second life of electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?. You will find practical tips on selecting, verifying, and installing used electronic components there.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as control units, engine management modules, or related electronic systems, check the available parts in the Mercedes electronic control modules and ECUs category.