Mercedes W204 C200 CDI OM646.920 136HP Engine ECU Kit A6461502634 Key Lock

Mercedes W204 C200 CDI OM646.920 136HP Engine ECU Kit is a practical solution for workshops and users who need a verified engine electronics package for a diesel unit. The set comes from the Electronic control modules and ECUs group, which guarantees component consistency and facilitates their integration with the vehicle's wiring. This allows you to restore the proper operation of the powertrain without the need for tedious programming from scratch.

Specifications and technical data

• SKU: A6461502634-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461502634
• Substitutable numbers: A6461502634, A 646 150 26 34, A0054467340, A 005 446 73 40, A2045451308, A 204 545 13 08
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and compatibility with the OM646.920 unit

The presented set is designed for the C200 CDI diesel engine from the OM646.920 family, used in the Mercedes C-Class W204 generation. Integrating the ECU with the key and lock allows for maintaining the consistency of the immobilizer system and starting logic, which significantly reduces the risk of software conflicts and engine start authorization issues.

This type of solution is particularly useful when replacing a damaged ECU after an electronics failure, water damage, or incorrect programming intervention. Using a complete ECU package with security elements facilitates the restoration of proper communication within the vehicle's CAN network and stable operation of the powertrain.

Technical characteristics of the ECU kit

The C200 CDI engine in the W204 is a modern diesel unit where the engine control unit is responsible for precise management of injection, boost pressure, fuel system operation, and cooperation with the automatic transmission. The use of a dedicated ECU module ensures:

• proper handling of diesel engine operating parameters,
• coordination of torque with the automatic transmission,
• stable communication with other body and comfort modules,
• preservation of factory engine and transmission protection strategies.

As a result, this set provides a functional base for powertrain repair, especially in cases where it is necessary to replace several electronic components at once.

Benefits of using a complete ECU kit with key and lock

Choosing a complete engine control unit set with a key and lock brings a number of practical installation benefits. The most important of these are:

• Reduced need for immobilizer programming – the components are factory-paired, which facilitates adaptation in the vehicle.
• Reduced risk of incompatibility between modules and the vehicle's wiring.
• Acceleration of the repair process – especially important in the work of professional service centers.
• Possibility of effective diagnostics after installation, using standard service tools.

A set configured in this way is a good choice both for a typical replacement of a damaged ECU and for more complex engine electronics repairs in a Mercedes C-Class.

Application area and related Mercedes modules

The engine electronics in the Mercedes W204 work with many other vehicle modules, such as comfort controllers, safety systems, or automatic transmission modules. A properly selected ECU kit with a key and lock allows for maintaining the consistency of the entire system, which translates into stable operation of the starting function, steering lock, remote control operation, and communication with the instrument cluster.

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

Professional service tips and knowledge about electronic modules

When working with engine electronics and security modules, it is worth using reliable sources of knowledge regarding diagnostics, common faults, and methods for verifying used components. A good starting point may be an article describing a practical approach to repairing controllers and comfort modules in premium vehicles – you can find it here: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models. Although it concerns a different brand, the issues discussed there relate to general principles of working with automotive electronics and may also be helpful when servicing a Mercedes.