Mercedes W169 W245 A180 B180 CDI OM640.940 109HP Engine ECU Kit A640150363 Key

Mercedes W169 W245 A180 B180 CDI OM640.940 109HP Engine ECU Kit A640150363 Key is a complete engine control unit kit with key, designed for A-Class and B-Class models with the OM640.940 diesel engine. This item from the Electronic Control Units and Controllers group ensures consistent powertrain operation, facilitating professional repair or replacement of the factory controller in Mercedes A180 CDI and B180 CDI vehicles.

Specifications and technical data

• SKU: A6401503634-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6401503634
• Substitutable numbers: A6401503634, A 640 150 36 34, 0281015122, 0 281 015 122, A1695452108, A 169 545 21 08, A1695452932, A 169 545 29 32
• Category: ECUs & Computer Modules

ECU Kit Application and Function

The presented engine control unit kit with key has been developed for Mercedes A-Class W169 and B-Class W245 vehicles equipped with the 109 HP OM640.940 diesel engine. Integrating the controller with a matched key allows for maintaining the consistency of the vehicle's immobilizer system and electronics, which significantly simplifies the installation process compared to replacing the module alone.

In practice, such a set is particularly useful in situations where the existing controller has suffered electronic damage, there are communication problems within the CAN network, or starting difficulties arise due to inconsistent immobilizer data. Using a matched kit helps reduce the need for additional programming and shortens vehicle downtime.

Benefits of Using an Original Mercedes Module

An original control module from a dismantled vehicle retains the factory engine operating characteristics, injection maps, and auxiliary control logic, which translates to predictable engine behavior. This ensures that the injection system, turbocharging, and engine protection systems work in accordance with the manufacturer's specifications.

The main advantages of this solution include:

• maintaining the factory operating parameters of the OM640.940 unit,
• consistency with the original electrical architecture of the A180 CDI and B180 CDI models,
• reduced risk of compatibility issues compared to low-quality aftermarket parts,
• the possibility of using the existing wiring harness and auxiliary components without modifying the vehicle's structure.

For workshops and owners, this means stable engine operation, predictable diagnostics, and easier long-term vehicle maintenance.

Technical Characteristics and Vehicle Integration

The ECU kit with key is the central component for managing the diesel engine's operation in Mercedes A and B-Class vehicles. The module communicates with other controllers in the vehicle, monitoring fuel injection quantity, boost pressure, starting parameters, and sensor signal responses, among other things. A correctly selected controller minimizes the risk of diagnostic errors and improper operation of auxiliary components.

In practice, installing such a kit requires adherence to manufacturer procedures, including correct connector connections, verification of the electrical system, and basic diagnostics after startup. For experienced service centers, this is a solution that allows for efficient and organized replacement of damaged engine electronics.

Condition, Origin, and Service Application

The offered kit is from a dismantled vehicle and is intended for reinstallation in compatible Mercedes models. Such components are often chosen by workshops specializing in the brand because they allow for economical yet technically correct repair of the engine control system. A used OEM module retains its original specifications, which is particularly important when working with modern diesel engines.

If you plan to use dismantled parts for other brands or are interested in a broader context of electronic module repairs, it's worth checking out our blog guide: How to Care for iDrive Systems and Electronic Modules in BMW 3 and 5 Series Using Used Parts. Although it concerns a different brand, it discusses universal principles for safely selecting and installing automotive electronics.

Support for Selection and Repair Extension

When planning engine control system repairs for a Mercedes, it's advisable to consider comprehensive diagnostics of the entire powertrain electronics, including other modules from the same group, wiring harnesses, and sensors that cooperate with the ECU. This helps prevent recurring faults and ensures stable engine operation after replacement.

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 related electronic units, check the available parts in the category Mercedes Electronic Control Units and Controllers.

Additional tips on making informed choices for dismantled parts, including potential pitfalls when buying used components, are also provided in the article: Common Mistakes When Choosing Used Parts for Tuning and Modifications. This is a practical supplement for those who want to combine savings with a safe approach to vehicle electronics.