Mercedes CL203 220CDI 646.963 Engine ECU Kit A6461503934 Key + Lock + Ignition

Mercedes CL203 220CDI 646.963 Engine ECU Kit Key + Lock + Ignition is a practical solution for workshops and users who need a proven engine electronics package for a diesel unit. The set comes from the Electronic control modules and controllers group, which facilitates selection in terms of installation and integration with the vehicle's factory wiring. Thanks to this, you can restore the proper operation of the powertrain without the need to program the entire security system from scratch.

Specifications and technical data

• SKU: A6461503934-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461503934
• Substitutable numbers: A6461503934 0281016185, A 646 150 39 34, 0 281 016 185, A2095453908, A0375456132
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented set is dedicated to the Mercedes CL203 220 CDI model with a diesel engine, working with an automatic transmission. The set includes an electronic engine control unit (ECU) along with a matched key, lock cylinder, and ignition switch, which allows for maintaining the consistency of the immobilizer system and facilitates installation in the vehicle.

A package configured in this way is particularly useful when replacing a damaged controller, or when dealing with starting problems resulting from communication errors with the immobilizer or failed attempts to program the electronics. Using a complete set minimizes the risk of software conflicts between modules.

Benefits of using a complete set

The ECU kit with key, lock, and ignition switch provides a number of practical advantages in daily service work:

• consistency of engine electronics and security system – the controller, key, and ignition switch are factory-matched,
• reduction of the need for advanced immobilizer programming,
• acceleration of the repair process compared to installing a single controller,
• maintaining proper cooperation with the automatic transmission,
• possibility of effective diagnostics after installation thanks to the predictable behavior of the module.

For workshops, this means shorter vehicle downtime and a lower risk of multiple customer visits. For the car owner – a faster return to full powertrain efficiency.

Technical characteristics in the context of installation

As an element from the Electronic control modules and controllers category, the set has been designed to work with a diesel engine and an automatic transmission. This is crucial when selecting parts – controllers for gasoline units or manual transmissions differ in hardware and software configuration, which is why it is important to match them to the specific vehicle specification.

Before installation, it is recommended to:

• verify compatibility by OEM number and interchangeable numbers in the service documentation,
• check the vehicle configuration (fuel type, transmission type),
• perform full diagnostics after installation to confirm proper communication with other modules in the vehicle network.

This way of working allows you to reduce the risk of CAN communication errors and incorrect operation of functions related to starting and engine operation.

Product condition and application in service practice

The offered set is a used item, which in workshop practice often represents a reasonable compromise between repair cost and functionality. Used control electronics in many cases allow for effectively restoring vehicle efficiency while maintaining full functionality of the powertrain, provided it is properly selected and installed.

To better understand the principles of selecting and installing such components, it is worth reading the guide on control modules and sensors. Practical tips, examples, and answers to the most frequently asked questions can be found in the article Used automotive electronics – second-hand ECU modules and sensors.

Support for selection and expansion of the control system

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, comfort modules, or engine management units, check the available parts in the Mercedes electronic control modules and controllers category.

Thanks to this, you can build a coherent set of electronics matched to the specific configuration of your vehicle, which will facilitate diagnostics, service, and any future upgrades.