Mercedes W204 C220 CDI 170HP M646.811 Engine Unit ECU Kit A6461502734 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 for vehicles with the 170 HP M646.811 engine unit. The kit is matched to vehicles with an automatic transmission and diesel fuel, which facilitates restoring the full efficiency of the powertrain after an electronics failure.

Specifications and technical data

• SKU: A6461502734
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461502734
• Substitutable numbers: A6461502734, A0054467440, A 005 446 74 40, A2045451308, A 204 545 13 08, A2045456732, A 204 545 67 32
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented kit includes an electronic engine control unit along with immobilizer components (ignition switch, key), which allows for seamless cooperation of all components in the Mercedes W204 C220 CDI powertrain. The controller is responsible for precise engine management, fuel dosing, cooperation with the automatic transmission, and communication with other modules in the vehicle.

A kit configured in this way is particularly useful in situations where the original ECU has been damaged, there are problems with the immobilizer, or unsuccessful programming attempts have occurred. Using a complete package minimizes the risk of software conflicts and reduces diagnostic time.

Benefits of using a complete kit

Using a ready-made ECU kit with an ignition switch and key in a Mercedes W204 C220 CDI brings a number of practical technical benefits:

• consistency of engine electronics and immobilizer, reducing the need for complicated key coding,
• better compatibility with the existing vehicle installation,
• the possibility of faster vehicle startup after a controller failure,
• adaptation to work with an automatic transmission and the appropriate fuel type.

Thanks to this solution, the workshop or user can focus on correct installation and basic configuration, rather than time-consuming attempts to adapt incomplete electronics.

Application in the Mercedes W204 powertrain

The ECU kit with key and lock is designed to work with the 170 HP M646.811 engine in the W204 generation Mercedes C-Class. The control unit communicates with the vehicle network, monitoring engine operating parameters, throttle response, and interaction with the automatic transmission. A correctly selected kit allows for maintaining the factory performance characteristics of the drive, which is important for both dynamics and component durability.

When replacing a damaged ECU with another used component, it is essential to match the OEM part number and interchangeable numbers – this kit has been prepared specifically for such use, which facilitates selection based on service documentation and manufacturer data.

Characteristics of the used product

The offered kit is a used item, which in practice means a favorable compromise between repair cost and maintaining the original manufacturer's specification. Used Electronic control modules and controllers in many cases allow for effective vehicle repair without the need to invest in new, much more expensive components. With proper installation and diagnostics, such a kit can continue to operate in the vehicle for a long time.

To better understand when choosing a used engine controller is justified, how to assess its suitability, and what to pay attention to during installation, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

Expanding repairs within Mercedes electronics

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, modules cooperating with the ECU, or related electronic systems, check the available parts in the Mercedes electronic control modules and controllers category.