Mercedes W207 A207 E350 BlueTec OM642.838 Engine ECU KIT A6429003401 Key Lock

Mercedes W207 A207 E350 BlueTec OM642.838 Engine ECU KIT Key Lock is a set from the Electronic control modules and controllers group, designed for the powertrain of the Mercedes E-Class W207/A207 generation with a BlueTec diesel engine. The set ensures consistency between the engine control unit and the immobilizer, which facilitates professional repair or replacement of the engine controller in a service environment.

Specifications and technical data

• SKU: A6429003401-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6429003401
• Substitutable numbers: A6429003401, A 642 900 34 01, 0281019416, 0 281 019 416, A2189053501, A 218 905 35 01
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented engine controller set with ignition lock and key is dedicated to Mercedes E-Class coupe or cabriolet W207/A207 models with the OM642 BlueTec unit. The complete configuration of electronic components allows for maintaining compatibility with the vehicle's factory architecture, which is particularly important when replacing a damaged engine controller or troubleshooting vehicle starting issues.

By maintaining the original operating logic of the control system, the set enables stable communication with other modules in the vehicle, such as safety or comfort systems. This is a solution that minimizes the risk of software conflicts and reduces the need for deep modifications to the vehicle's software.

Benefits of using an original Mercedes module

Choosing an original module from a Mercedes dismantling is a reasonable compromise between cost and quality. The set comes from a vehicle of the same brand, which translates into:

• maintaining the factory performance characteristics of the engine and accessories,
• better compatibility with the electrical installation and CAN network,
• reduction of adaptation problems compared to low-quality replacements.

A control set configured in this way is particularly useful in situations where the existing controller has suffered electronic damage, water damage, or cannot be programmed correctly. Using a set with a key and lock simplifies the process of restoring vehicle functionality, as the key components of the security system are already synchronized.

Characteristics of the used ECU kit

The offered set is a used item, which in practice means it comes from a previously operated vehicle but retains full functionality required for further operation in another car. This type of solution is often chosen by workshops specializing in the Mercedes brand because it allows for economical repair while maintaining the manufacturer's original specifications.

Before installation, it is recommended to perform a standard verification of the vehicle's electrical installation and check the correctness of grounds and power supply to avoid re-damaging the module. Professional installation and potential software adaptation at a specialized service center increase the chances of trouble-free operation of the engine control system.

Application in service practice

The ECU kit with lock and key will work well both in independent workshops and in services specializing in the Mercedes brand, where fast diagnosis and effective repair are essential. The set is particularly useful in cases of:

• electronic damage to the engine controller,
• immobilizer problems preventing the engine from starting,
• the need to replace the control set after a major installation failure.

Thanks to the consistency of the electronic components, you can reduce the time needed for configuration and focus on correct installation and road tests. This is a practical solution for mechanics who want to restore full powertrain functionality without unnecessary complications.

Expanding repairs within vehicle electronics

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as an engine controller, light module, or comfort module, it is worth checking the advice contained in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?, which discusses good practices for working with used electronic modules.

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