Mercedes C219 CLS 320 642.920 224HP Engine Unit ECU Kit A6421508091 Key Lock

Complete Engine Control Unit (ECU) Kit with Ignition Switch and Key for Mercedes CLS C219 320 CDI is a professional solution designed for diesel engines paired with an automatic transmission. This kit originates from the genuine Mercedes line and belongs to the Electronic Control Modules and Controllers group, ensuring seamless integration with the vehicle's factory systems. It serves as a practical foundation for repairing or replacing the engine control system in CLS C219 320 CDI models.

Specifications and technical data

• SKU: A6421508091-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421508091
• Substitutable numbers: A6421508091, A 642 150 80 91, 0281013496, 0 281 013 496, A2034621130, A 203 462 11 30, A2115452308, A 211 545 23 08
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

ECU Kit Purpose and Function

The presented control kit is dedicated to the diesel engine in the Mercedes CLS C219 320 CDI, specifically for versions equipped with an automatic transmission. It is responsible for managing the engine's operation, including precise fuel delivery, monitoring operating parameters, and communicating with other vehicle modules. Utilizing a complete ECU package with an ignition switch and key simplifies restoring proper electronic system functionality after a failure or engine replacement.

Benefits of Using an Original Control Module

Employing an original control module from the same family as the one factory-installed in the Mercedes CLS C219 helps maintain software consistency and the operational logic of the vehicle's systems. In practice, this means:

• preserving the correct operating characteristics of the diesel engine,
• proper interaction with the automatic gearbox,
• compatibility with factory security features and the immobilizer system,
• reduced risk of communication errors between modules.

This makes the kit particularly useful for professional repairs where electronic stability and the ability to replicate a factory-like configuration are crucial.

Application in Diesel Systems with Automatic Transmission

The diesel engine in the Mercedes CLS C219 320 CDI requires precise control, especially when paired with an automatic transmission. The ECU module used here is adapted to handle the torque characteristics typical of diesel engines and to interface with the automatic transmission's electronics. Appropriate control maps and CAN communication logic translate into:

• smooth gear changes under various loads,
• improved throttle response,
• consistent operation of driver assistance systems.

Replacing the kit with a compatible component from the same controller family is often the most straightforward way to restore proper powertrain operation after electronic damage.

Product Characteristics and Condition

The offered ECU kit with ignition switch and key is a used part, meaning it comes from a dismantled vehicle and may show signs of wear typical for this category of components. This type of solution is often chosen by workshops and users seeking an economical yet factory-compliant alternative to new modules. Before installation, a standard diagnostic procedure and verification of compatibility with the specific vehicle configuration are recommended.

Integration with Other Modules and Parts Selection

As a component from the Electronic Control Modules and Controllers group, the ECU kit interacts with numerous other modules in the vehicle (including comfort systems, security, and powertrain). When selecting parts, it's important to consider the compatibility of the controller generation, engine type, and transmission type. Comparing the main part number and interchangeable part numbers is helpful in matching the component to a specific equipment version.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and require other parts from the same group, such as engine controllers, comfort modules, or transmission controllers, check the available parts in the Mercedes Electronic Control Modules and Controllers category.

Technical Support and Selection of Used Modules

When working with electronics in premium vehicles like the Mercedes CLS, proper selection of used modules and understanding the interdependencies between controllers are key. It is beneficial to draw on experience gathered with other premium brands – an article describing how original modules and equipment elements influence a car's character can serve as a good reference. More on this topic can be found in the material: Audi and Pure Emotion. How Used Parts Help Maintain Brand DNA?.