Mercedes CL203 CLC200 CDI 122HP M646.963 Engine ECU Kit A6461501934 Key Lock

The Mercedes CL203 CLC200 CDI 122HP M646.963 Engine ECU Lock Key Set is a complete package of electronic components designed for the powertrain in Mercedes models with an automatic transmission. The set includes the engine control unit, immobilizer, and key, facilitating a cohesive replacement of components in a petrol-powered vehicle. This is a practical solution for workshops and users seeking original electronics tailored to a specific car configuration.

Specifications and technical data

• SKU: A6461501934-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461501934
• Substitutable numbers: A6461501934, 0281015562, 0 281 015 562, A2095453908, A 209 545 39 08, A0375456132, A 037 545 61 32, KZ
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Set Purpose and Function

The presented set is part of the Electronic Control Modules and Controllers group, responsible for managing the engine's operation and the vehicle's security systems. The combination of the engine control unit with the immobilizer and key ensures the consistency of the immobilizer system, which is crucial for both proper starting and vehicle security.

This solution is particularly useful when replacing a damaged control unit in Mercedes cars with a CLC200 CDI 122 HP engine, where matching the electronics to the specific fuel type and automatic transmission is essential.

Benefits of Using an Original ECU Set

Using a complete, original ECU set with immobilizer and key minimizes the risk of adaptation and programming issues. In practice, this means:

• maintaining compatibility with the vehicle's factory electrical architecture,
• consistent operation of the immobilizer and engine control unit,
• easier diagnostics during subsequent inspections,
• stable cooperation with the automatic transmission.

For workshops, this translates to shorter installation times and fewer potential errors, and for users, it means more predictable vehicle behavior after repair.

Technical Characteristics and Compatibility

The set has been developed for the CLC200 CDI 122 HP engine in the CL203 body style, taking into account the specifics of petrol fueling and automatic transmission. Proper matching of the control unit's operating parameters to the engine and transmission characteristics influences:

• correct control of fuel delivery and ignition,
• smooth gear changes in automatic mode,
• stable idle speed and throttle response.

As a Mercedes brand component, the set maintains factory quality standards and control logic, which is important for repairs of premium-class vehicles.

Practical Application in Service

Replacing the complete ECU set with immobilizer and key is a frequently chosen solution when the existing control unit has been damaged or there are communication problems within the vehicle network. Using a ready-made set:

• simplifies coding procedures,
• reduces the risk of module incompatibility,
• allows for quicker restoration of full vehicle functionality.

To better understand how to utilize used electronic modules in repairs, it is worth reading the article on the impact of used OEM parts availability on repair time and workshop operations, which illustrates practical aspects of selecting such components.

Why Choose a Used Original Module?

A used, original engine ECU set with immobilizer and key offers a sensible compromise between cost and quality. Compared to low-quality aftermarket alternatives, it provides:

• factory fit for the Mercedes electrical system,
• preservation of original security logic,
• greater long-term operational predictability.

For a more comprehensive understanding of the role of control units and modules in modern cars, you can also refer to the material explaining how to care for electronic systems and engine control units in premium vehicles, which will facilitate informed planning of repairs and upgrades.