Mercedes W204 C220 CDI 651.911 136HP Engine Unit ECU Kit A6519007500 Key Lock

Complete ECU Engine Control Unit Kit with Key and Lock for Mercedes W204 C220 CDI is a professional service solution designed for the 651.911 engine unit with 136 HP. This used, fully functional kit from the Electronic Control Modules and Controllers category allows for efficient replacement of a damaged control system without the need for costly, time-consuming adaptation of multiple individual components. Thanks to factory configuration for a specific model, it ensures consistent operation of the engine electronics and security systems.

Specifications and technical data

• SKU: A6519007500-19
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6519007500
• Substitutable numbers: A6519007500, A 651 900 75 00, A0064461540, A 006 446 15 40, A2079052600
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and Compatibility with Mercedes W204 C220 CDI

The presented ECU kit has been prepared for the Mercedes W204 C220 CDI model with a 651.911 diesel engine producing 136 HP, paired with an automatic transmission. A properly selected engine control unit along with the key and lock ensures compatibility with the factory immobilizer system and the engine unit's operating logic, which is particularly important for modern common rail systems.

By maintaining consistency between the engine electronics, the lock module, and the key, the kit minimizes the risk of starting problems, CAN network communication errors, and incorrect operation of the vehicle's security functions.

ECU Kit Construction and Benefits of Complete Installation

The offered kit includes the ECU engine control unit with a matched key and lock, which significantly simplifies the service process compared to replacing a single module. The kit is configured for a specific engine unit and transmission type, thus maintaining the correct engine operating characteristics, injection maps, and communication with the automatic transmission.

In practice, installing the complete kit results in:

• reduced need for immobilizer programming and key coding,
• maintained proper cooperation with comfort and safety systems,
• decreased risk of software incompatibility between modules.

Operating Characteristics with Diesel Engine and Automatic Transmission

The diesel engine in the C220 CDI requires precise control of fuel injection, common rail pressure, and advanced monitoring of operating parameters under various load conditions. The Electronic Control Module in this kit is designed precisely for such characteristics, ensuring stable operation of the diesel unit, smooth acceleration, and proper response to load changes.

Cooperation with an automatic transmission additionally requires precise data exchange between the ECU and the transmission module. A properly selected control unit supports correct gear shift points, downshifts under load, and smooth starting, which directly impacts the drivetrain's durability and driving comfort.

Condition, Verification, and Installation Recommendations

The product is used, meaning it comes from a dismantled vehicle but has been verified for its suitability for further operation. This type of solution is particularly cost-effective compared to new modules, while maintaining the original controller's operating specifications. Before installation, standard vehicle diagnostics and verification of configuration compatibility with the specific vehicle equipment version are recommended.

To ensure a trouble-free installation, it is advisable to entrust the mounting to a workshop experienced with Mercedes electronics, which will allow for proper integration of the kit with the existing electrical system and vehicle security systems.

If you are planning a comprehensive repair or upgrade of the engine control area in your Mercedes and need other parts from the same group, such as control units, comfort modules, or security systems, check the available parts in the Mercedes Electronic Control Modules and Controllers category.

Technical Support and Knowledge of Used Electronics

Selecting the appropriate ECU kit for a specific Mercedes version requires considering the engine unit's designation, fuel type, and transmission type. Correct identification by OEM and reference numbers helps avoid problems with software compatibility and communication with other modules in the vehicle.

If you want to deepen your knowledge on selecting and installing used control units and sensors, as well as learn practical tips on hardware and software compatibility, check out the guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECU Modules and Sensors?