Mercedes W212 E350 CDI OM642 Engine Unit ECU Kit A6421508900 Keys Lock Automatic

Mercedes W212 E350 CDI OM642 Engine Unit ECU Kit Keys Lock Automatic is an advanced, used set from the Electronic control modules and controllers category, designed for vehicles with an automatic transmission and the OM642 engine. The set includes the engine control unit, immobilizer components, and lock elements, which allows for a consistent, technically correct replacement of the powertrain control system. This solution is particularly useful for professional engine electronics repairs, where maintaining compatibility between the ECU, key, and ignition lock is required.

Specifications and technical data

• SKU: A6421508900-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421508900
• Substitutable numbers: A6421508900, A 642 150 89 00, 0281016656, 0 281 016 656, A2129055400, A 212 905 54 00
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and function of the ECU kit

The presented ECU kit is intended for Mercedes E-Class W212 generation models in the E350 CDI version with the OM642 unit. Integrating the engine controller with the key and lock ensures the consistency of the immobilizer system, which facilitates adaptation in the vehicle and reduces the risk of software conflicts.

In practice, such a set allows for:

• restoring the correct operation of the engine control system after an electronics failure,
• maintaining compatibility between the controller, ignition lock, and key,
• reducing diagnostic time compared to sourcing individual modules.

Benefits of using a complete kit

Using a complete Mercedes W212 E350 CDI OM642 Engine Unit ECU Kit Keys Lock Automatic brings measurable service benefits. Consistency of electronic components minimizes the need for deep software intervention and also reduces the risk of start authorization issues. This is particularly important in vehicles with an automatic transmission, where the engine controller works in conjunction with other powertrain modules.

A used set of this type represents a reasonable compromise between repair costs and maintaining the vehicle's original electronic architecture. A properly selected control module allows for maintaining the operating characteristics of the OM642 unit in accordance with the manufacturer's factory specifications.

Compatibility and selection by numbers

The selection of this ECU kit for a specific Mercedes W212 E350 CDI unit should be based on the OEM part number and available interchangeable numbers, visible in the technical specifications section. This allows for precise matching to the engine version, fuel type, and automatic transmission configuration.

In practice, this means that before installation, it is worth:

• comparing part numbers with vehicle data,
• verifying compatibility with the OM642 unit,
• consulting the installation with a service center experienced in Mercedes electronics.

Condition of the item and installation aspects

The offered set is in used condition, which, in the case of Mercedes electronics, allows for an economical repair while maintaining the original specification. Installation requires basic knowledge of control systems and access to appropriate diagnostics to correctly perform adaptation procedures in the vehicle.

Due to the complexity of the immobilizer system, it is recommended that the installation be carried out by a workshop specializing in the Mercedes brand, which will allow for fully utilizing the kit's potential and avoiding problems with starting the vehicle.

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 controllers, comfort modules, or powertrain management units, check the available parts in the Mercedes electronic control modules and controllers category.

Substantive support and knowledge development

To compare how manufacturers approach electronics and maintain the vehicle's character, it is worth reading an article describing how original modules affect the behavior of a premium class car. An example is the text about the Audi brand, which discusses the role of factory components in maintaining driving properties and the quality of multimedia systems – more information can be found in the material Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?.