Mercedes W211 E280 CDI OM642.920 Engine Module ECU Kit A6421503226 Key Lock

Mercedes W211 E280 CDI OM642.920 Engine Module ECU Kit is a precisely selected electronic set designed for the powertrain system. By maintaining the factory engine electronics architecture, it ensures consistent operation of all related systems and facilitates the restoration of full vehicle functionality after an ECU failure. The set belongs to the Electronic control modules and controllers category, allowing for professional service and diagnostic handling.

Specifications and technical data

• SKU: A6421503226-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421503226
• Substitutable numbers: A6421503226, A 642 150 32 26, 0281014919, 0 281 014 919, A2115452308, A 211 545 23 08
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented kit is designed to work with the OM642.920 diesel engine in the Mercedes E-Class W211 generation, E280 CDI version. The set includes the engine control unit (ECU) along with the components necessary for proper interaction with the immobilizer system, including the ignition switch and key. This combination allows for maintaining compatibility with the factory immobilizer system and reduces the risk of startup authorization issues after installation.

The ECU is responsible for managing the engine's operation, including fuel injection, boost control, combustion parameter monitoring, and communication with the vehicle's onboard systems. Using a complete set from a single vehicle facilitates adaptation in the target car and reduces the time required for configuration.

Benefits of using a complete control module

The ECU kit with ignition switch and key allows for the seamless transfer of security logic from the donor vehicle to the target vehicle. In practice, this means:

• minimizing communication issues between the engine controller and the immobilizer system,
• easier vehicle startup after replacing the electronics,
• maintaining compatibility with the factory CAN bus architecture in the Mercedes W211,
• the possibility of professional diagnostics using standard service tools.

For workshops specializing in the Mercedes brand, such a kit is a practical solution for repairs following controller damage, water ingress, or communication problems within the powertrain.

Characteristics of the Electronic control modules and controllers category

The product belongs to the Electronic control modules and controllers group, which are components responsible for processing sensor signals and controlling the vehicle's actuators. In the case of diesel units such as the OM642.920, a correctly selected controller is crucial for stable engine operation, smooth performance, exhaust emissions, and interaction with the automatic transmission and safety systems.

When choosing a used ECU kit, it is worth paying attention to compatibility with the specific engine version and vehicle model year, as well as the possibility of subsequent software adaptation if needed. Professional installation and verification of operating parameters after installation are recommended to fully utilize the potential of this solution.

Condition, origin, and service application

The offered kit comes from dismantling and is intended for reinstallation in a vehicle with a similar configuration. This type of solution is often chosen by workshops and users who want to restore the efficiency of the powertrain while maintaining reasonable service costs. Using an original set from the same model family increases the chance of correct interaction with the electrical installation and other modules in the car.

Before installation, it is recommended to perform diagnostics and – if necessary – adjust the configuration to the specific vehicle. This helps reduce the risk of communication errors between modules and ensures stable engine operation in daily use.

Technical support and selection of used electronics

If you are considering using a used engine controller or a complete ECU kit with ignition switch and key, it is worth familiarizing yourself with practical tips regarding the selection and installation of such components. A detailed discussion of the topic can be found in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which describes, among other things, what to look for when purchasing and how to reduce the risk of incompatibility.

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 units, check the available parts in the Mercedes electronic control modules and controllers category.