Mercedes W204 C220 CDI 170HP M646.811 Engine Unit ECU Kit A6461503734 Key Lock

Mercedes W204 C220 CDI 170HP M646.811 Engine Unit ECU Kit Key Lock is an advanced component from the Electronic control modules and controllers category, designed to work with the M646.811 170HP powertrain. The kit is configured for a specific drivetrain setup, which facilitates the restoration of full functionality to the engine control system and the vehicle's starting system.

Specifications and technical data

• SKU: A6461503734-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461503734
• Substitutable numbers: A6461503734, A 646 150 37 34, A0054467440, A 005 446 74 40, A2075450108, A 207 545 01 08
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented kit includes the electronic engine control unit along with immobilizer components, allowing for consistent management of the powertrain in the Mercedes C-Class W204 generation, C220 CDI version. The controller works with the 170HP M646.811 engine, providing appropriate operating maps, combustion parameter control, and communication with other vehicle systems.

The ECU kit with key and lock is particularly useful when replacing a damaged controller or dealing with starting authorization issues, as it ensures compatibility between the engine electronics and the vehicle's security system.

Compatibility with drivetrain and fuel system

This kit has been prepared for use with vehicles equipped with an automatic transmission, which is crucial for proper communication between the engine controller and the transmission control module. The appropriate software and configuration ensure correct data exchange regarding load, torque, and gear-shifting strategies.

The control unit is designed for a configuration powered by diesel fuel, which determines the characteristics of injection maps, ignition, and engine protection strategies. This allows the ECU to precisely manage the engine's operation in accordance with the manufacturer's factory specifications.

Practical application and benefits of installation

Using a complete ECU kit with key and lock helps reduce diagnostic and programming time when replacing a faulty controller. In many cases, it:

• facilitates the restoration of proper vehicle starting after an electronics failure,
• ensures consistency between the engine controller and the immobilizer system,
• minimizes the risk of communication errors with the automatic transmission,
• allows for maintaining engine performance characteristics consistent with the factory configuration.

For workshops specializing in the Mercedes brand, such a kit is a convenient service solution that can shorten repair time and reduce the number of additional programming steps required.

Product characteristics and category

The offered kit belongs to the Electronic control modules and controllers category, a group of components responsible for advanced management of vehicle sub-assemblies. In the case of the Mercedes W204 C220 CDI, it is crucial to maintain module compatibility with the specific engine and transmission version to avoid communication issues within the vehicle's network.

The item comes from a Mercedes vehicle and is marked as used, which in practice means that before installation, it is recommended to perform a standard verification of its condition and, if necessary, adapt the configuration to the specific vehicle at a specialized service center.

Expanding the control system in a Mercedes

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 units working with the powertrain, check out the available parts in the Mercedes electronic control modules and controllers category.

To compare how manufacturers approach maintaining brand character and electronic quality, it is worth reading the material describing how original components influence the preservation of vehicle properties – more information can be found in the article Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?.