Mercedes W203 C220 CDI 646.963 150HP Engine ECU Kit A6461500091 + Key + Lock

Mercedes W203 C220 CDI 646.963 150HP Engine ECU Kit + Key + Lock is a factory module from the Electronic control modules and ECUs group, designed for precise management of the diesel engine unit. The ECU works with the diesel engine and automatic transmission, ensuring stable operation of the drivetrain and proper communication with other vehicle systems.

Specifications and technical data

• SKU: A6461500091-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461500091
• Substitutable numbers: A6461500091, A 646 150 00 91, 0281012222, 0 281 012 222
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine ECU

The offered control unit is dedicated to the Mercedes W203 C220 CDI 646.963 150HP model, where it plays a key role in controlling the operating parameters of the diesel engine. The module manages fuel injection, cooperation with auxiliary equipment, and communication with the automatic transmission, which translates into smooth acceleration, predictable throttle response, and correct operation of safety systems.

By using an original ECU from the same family, compatibility with the vehicle's electrical architecture, communication bus, and factory control strategies is maintained. This solution is particularly recommended for professional repairs when you want to preserve the original performance characteristics of the engine unit.

Compatibility, interchangeable numbers, and identification

The module belongs to the Electronic control modules and ECUs group, which means it has been designed to work with the factory Mercedes electrical installation. It has an assigned OEM part number and a set of interchangeable numbers that facilitate clear identification when selecting components in service catalogs and diagnostic systems.

The presence of reference numbers allows you to verify the compatibility of the ECU with a specific diesel engine version and automatic transmission configuration. Before purchasing, it is worth comparing the markings with the vehicle data or consulting a mechanic to ensure full compatibility with the wiring harness and other modules in the car.

Operating parameters: diesel engine and automatic transmission

The ECU has been prepared to support a diesel-powered engine, which means adapted injection maps, boost pressure control logic, and cooperation with equipment typical for diesel engines. Integrated operating algorithms are optimized for diesel characteristics, ensuring stable starting, smooth idling, and predictable behavior under load.

At the same time, the module communicates with the automatic transmission, coordinating gear shift timing with the current engine load. This configuration promotes driving smoothness, reduces jerking during gear changes, and supports the proper operation of driver assistance systems that use data transmitted by the engine ECU.

Condition, application, and installation recommendations

The offered control unit is a used item, making it an attractive cost-effective solution while maintaining the manufacturer's original specifications. Such modules are often chosen for post-accident repairs, damage caused by electrical surges, or failures resulting from ECU water damage.

During installation, it is recommended to perform professional diagnostics, potentially match the software to the specific vehicle, and check the correctness of the ground and power supply installations. A correctly selected and configured ECU allows for the restoration of full drivetrain functionality without the need for an expensive purchase of a new unit.

Expansion of the electronic system and additional information

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 control modules, auxiliary controllers, or controllers working with the engine unit, check the available parts in the Mercedes Electronic control modules and ECUs category.

For those interested in a broader context of how electronic modules work in premium vehicles, including engine ECUs, a guide on the operation and repair of systems in other brands may be useful. You can find more about the use of used ECUs and modules in premium segment cars in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using salvaged parts?.