Mercedes C219 CLS 320 642.920 224HP Engine Module Unit ECU A6421503972 Automatic

The Mercedes CLS C219 320 CDI Engine Control Module is a specialized controller designed for the 642.920 diesel engine, producing 224 HP, and paired with an automatic transmission. As part of the Electronic Control Modules and Controllers group, it is responsible for precise engine operation management, injection parameters, and communication with other vehicle systems, ensuring stable and predictable powertrain performance.

Specifications and technical data

• SKU: A6421503972
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421503972
• Substitutable numbers: A6421503972, A 642 150 39 72, 0281014323, 0 281 014 323
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Function of the Engine Controller

The presented ECU module is dedicated to the Mercedes CLS C219 320 CDI model with the 642.920 diesel engine, delivering 224 HP, and operating with an automatic gearbox. The controller is responsible for managing key engine operating parameters such as fuel delivery, boost pressure, and injector correction values, as well as for data exchange with other modules in the vehicle.

Thanks to its factory architecture, the module is optimized for seamless integration with the powertrain of this specific engine-transmission variant, allowing for the preservation of proper dynamics, smooth operation, and compliance with factory control maps.

Benefits of Using an Original ECU Module

Using an original engine controller in the Mercedes CLS C219 320 CDI restores correct vehicle network communication and stable operation of systems responsible for performance and safety. A module from this group ensures:

• preservation of factory diesel engine operating characteristics,
• proper cooperation with the automatic transmission,
• consistency with other electronic modules in the vehicle,
• the possibility of further diagnostics using standard service tools.

For the user, this translates to more predictable vehicle behavior, easier diagnosis of potential faults, and a reduced risk of problems arising from improperly selected aftermarket parts.

Technical Characteristics and Vehicle Integration

The ECU module belongs to the Electronic Control Modules and Controllers category, meaning it is an integral part of the vehicle's electronic architecture. It communicates with engine sensors, the injection system, the automatic transmission control system, and other controllers on the CAN network.

Due to the specifics of the diesel engine and the use of an automatic transmission, the controller is configured for diesel engine operation and appropriately selected gear change maps. In practice, this results in smoother acceleration, better throttle response, and correct operation of engine protection functions.

Application of Used Parts in Professional Repairs

The offered module is a used part, which for engine controllers often represents a sensible compromise between repair cost and maintaining factory quality. When correctly selected and installed, it can effectively resolve issues with vehicle starting, uneven engine operation, or electronic network communication errors.

For more complex electronic system repairs, it is advisable to expand your knowledge of diagnostics and the use of salvaged parts. Practical tips can be found in the article on servicing electronic modules and engine controllers in BMW vehicles using used parts, which discusses universal principles for selecting and installing such components.

Expanding Engine Control Repairs

If you are planning a comprehensive engine area repair or upgrade for your Mercedes and require other parts from the same group, such as additional controllers, engine management modules, or systems that work with the ECU, check the available parts in the Mercedes Electronic Control Modules and Controllers category.

When planning larger service work on the powertrain, including the gearbox, the guide on the cost-effectiveness of purchasing a used gearbox and its selection principles, which compares solutions for manual and automatic transmissions, may also be helpful.