Mercedes W221 S350 BlueTEC OM642.862 Engine ECU Kit A6421508900 Key Ignition

Mercedes W221 S350 BlueTEC OM642.862 Engine ECU Kit Key Ignition is a precisely selected, used set from the Electronic control modules and controllers category, designed for vehicles with an automatic transmission and gasoline engine. The kit ensures the consistency of electronic components responsible for starting, key authorization, and engine operation, which facilitates professional repair or replacement of a faulty system.

Specifications and technical data

• SKU: A6421508900-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421508900
• Substitutable numbers: A6421508900, A 642 150 89 00, 0281016656, 0 281 016 656, A2169050100, A 216 905 01 00, KZ
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented control kit is dedicated to the Mercedes S-Class W221 generation, S350 BlueTEC version with the OM642.862 engine. The set includes an electronic engine ECU along with components responsible for ignition handling and key authorization, which allows for maintaining software and coding consistency within a single vehicle.

A kit configured in this way is particularly useful in situations where there has been an engine controller failure, CAN network communication issues, or incorrect key recognition by the vehicle. Using a single, matched set minimizes the risk of software conflicts and speeds up the diagnostic and installation process.

Compatibility with the drivetrain

The product is intended for cars equipped with an automatic transmission, which is significant for torque control logic, gear shifting, and cooperation with the transmission module. The kit is also adapted for vehicles powered by gasoline fuel, ensuring that injection maps, ignition timing, and engine operating strategies are consistent with the factory specifications for this configuration.

Selecting the appropriate ECU kit with a key and ignition switch is crucial for maintaining proper cooperation with other electronic modules in the vehicle, such as the comfort module, safety systems, or driver assistance systems.

Application in professional service and diagnostics

In workshops specializing in the Mercedes brand, such a kit allows for:

• faster verification of faults related to starting and immobilizer communication,
• reducing the need for time-consuming programming of individual modules separately,
• checking the correct engine operation after replacing the controller under conditions close to factory standards.

For end users, this means the possibility of restoring vehicle functionality using a complete, matched set, without the need for interference with the electrical installation beyond the standard scope of assembly.

Product characteristics and condition

The set comes from dismantling and is offered as a used control kit. This type of solution is often chosen as an economical alternative to new modules, while maintaining the original manufacturer's specifications. In practice, this enables the restoration of full functionality of the engine control system at lower repair costs.

As an element from the Electronic control modules and controllers category, the ECU kit with key and ignition switch is the central point for managing engine operation, and its correct selection has a direct impact on engine stability, user comfort, and vehicle operational safety.

Expanding knowledge about electronic modules

If you want to better understand how advanced control systems in modern cars work, including engine modules, multimedia systems, and body controllers, it is worth reading an article describing a practical approach to repairing electronics in premium vehicles. You will find useful information in the material: how to take care of iDrive systems and electronic modules using parts from dismantling.

Related control modules for Mercedes

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 additional controllers, engine management modules, or related electronic systems, check the available parts in the Mercedes electronic control modules and controllers category.

Summary

Mercedes W221 S350 BlueTEC OM642.862 – ECU kit with key and ignition switch is a practical solution for services and users who need a consistent control set for a vehicle with an automatic transmission and gasoline engine. A properly selected kit facilitates the repair process, reduces the risk of coding problems, and allows for maintaining the factory logic of electronic systems in an S-Class car.