Mercedes W211 E220 CDI OM646.961 150HP Engine Unit ECU Kit A6461532079 Key Lock

Mercedes W211 E220 CDI OM646.961 150HP Engine Unit ECU Kit Key Lock is a solution designed for the OM646.961 150HP unit with a manual transmission and diesel power supply. The set belongs to the Electronic control modules and ECUs category, which ensures a consistent selection of electronic components responsible for engine operation and start authorization.

Specifications and technical data

• SKU: A6461532079-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461532079
• Substitutable numbers: A6461532079, A 646 153 20 79, 0 281 011 158, 0281011158, A2115451408, A 211 545 14 08
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented set includes the engine ECU along with immobilizer components, which allows for maintaining compatibility between the engine electronics and the start lock system. It is dedicated to the diesel power unit working with a manual transmission, ensuring that the controller's operating parameters are matched to the characteristics of a manual gearbox.

A set configured in this way is particularly useful when replacing a damaged controller, dealing with immobilizer communication issues, or when it is necessary to transfer the entire engine control system within the same type of vehicle.

Benefits of using a complete kit

Using a ready-made ECU kit with a key and lock reduces the need for programming from scratch and minimizes the risk of incompatibility between modules. In practice, this means:

• consistency of the electronics responsible for starting and engine operation,
• easier diagnostics in case of previous immobilizer issues,
• preservation of correct maps and control strategies for the diesel engine,
• matching the configuration with a manual transmission.

For workshops and users, this means a more predictable repair process and the ability to restore full vehicle functionality faster.

Technical characteristics in the context of the engine and transmission

The set has been developed with a diesel engine in mind, which is why the logic for controlling fuel dosage, boost pressure, and accessory operation is adapted to the specifics of the CDI unit. The Diesel fuel type requires precise management of injection and pressure in the common rail system, which is performed by a properly configured ECU module.

The connection with the manual transmission affects how torque is handled, the cut-off strategy, and cooperation with other vehicle systems. As a result, the controller behaves predictably under typical operating conditions, such as starting, downshifting, or driving under load.

Product condition and application in service practice

The item comes from the secondary market, making it an attractive cost-effective alternative to new modules while maintaining the manufacturer's original design. In workshop practice, such a set is effective for:

• repairs after electrical damage to the controller,
• problems with key authorization and the immobilizer,
• replacing complete engine electronics within compatible configurations.

Before installation, it is recommended to verify compatibility using OEM and replacement numbers as well as vehicle configuration to ensure proper cooperation with the electrical system and other modules.

Support in selecting used electronics

If you want to better understand how to safely select used engine controllers and other electronic modules, how to check compatibility by numbers, and what to pay attention to during installation, check out our guide: Used automotive electronics – how to consciously choose ECU modules and sensors second-hand.

Additionally, you can expand your knowledge with practical tips on reusing electronics in a vehicle by reading this material: The second life of engine controllers, comfort modules, and parking sensors – when is it worth choosing used solutions.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as controllers, ECU modules, or electronic control units, check out the available parts in the Mercedes electronic control modules and ECUs category.