Audi A4 B9 2.0 TDI DEZE 163HP Engine ECU Kit Lock BCM Key 05L907309 Automatic

Audi A4 B9 2.0 TDI DEZE 163HP Engine ECU Kit Lock BCM Key is a complete Engine Control Unit designed for modern diesel units with an automatic transmission. The kit comes from a vehicle dismantling, which allows for an economical yet professional repair of the engine control system in your Audi, while maintaining factory operating logic and parameters.

Specifications and technical data

• SKU: 05L907309-4
• Mark: Audi
• Condition: Used
• OEM Part Number: 05L907309
• Substitutable numbers: 3Q0905861C, 3Q0 905 861 C, 8W1907063C, 8W1 907 063 C, 05L907309, 05L 907 309, 0281034002, 0 281 034 002
• Fuel type: Diesel
• Gearbox type: Automatic
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The presented engine control unit kit has been designed to work with the 2.0 TDI DEZE 163 HP unit in the Audi A4 B9 generation model. As an element in the Electronic control modules and controllers category, it is responsible for the precise management of the diesel engine's operation, including fuel dosing, boost control, auxiliary equipment operation, and communication with other vehicle systems.

The ECU is adapted for configuration with an automatic transmission, which is crucial for the proper operation of the drivetrain, smoothness of gear changes, and stability of the power unit in various driving modes.

Benefits of using a used ECU in an Audi A4 B9 2.0 TDI

Using a used engine control unit in an Audi A4 B9 2.0 TDI DEZE 163 HP allows for a significant reduction in repair costs compared to purchasing a new module, while maintaining high quality and compatibility with the factory installation. The ECU kit enables:

• restoration of full engine control system functionality after the original computer fails,
• maintenance of compliance with the vehicle's electrical and electronic architecture,
• reduction of vehicle downtime due to the possibility of quick replacement with a complete kit.

For workshops and services specializing in the Audi brand, such a kit is a practical service solution that facilitates diagnostics and installation, and minimizes the risk of communication problems in the CAN network.

Compatibility, interchangeable numbers, and identification

The controller belongs to the group of factory Audi solutions, and its identification is based on the OEM part number and available interchangeable numbers. This makes it possible to precisely match the module to the specific 2.0 TDI DEZE engine configuration and vehicle equipment version. The presence of reference numbers facilitates the selection of the appropriate ECU both in the service center and during the verification stage before purchase.

As an Engine Control Unit intended for a diesel engine with an automatic transmission, the kit is optimized for the characteristics of the diesel unit, including injection strategy, emission control, and cooperation with safety and comfort systems.

Product condition and service application

The offered engine control unit is a used item, sourced from dismantling, which makes it an attractive cost alternative to new modules. This type of solution is particularly beneficial in the case of:

• engine electronics failure requiring the replacement of the entire ECU,
• post-accident repairs where the engine computer was damaged,
• renovation projects and restoring full efficiency to fleet vehicles.

Before installation, it is recommended to perform standard service procedures, such as adaptation, potential coding, and synchronization with the immobilizer in accordance with the requirements of the specific Audi A4 B9 unit.

More solutions for Audi electronics

If you are planning a comprehensive repair or modernization of the engine area in your Audi and need other elements from the same group, such as controllers, modules, or management computers, check the available parts in the Audi electronic control modules and controllers category.

If you are considering using a used engine control unit or other electronic modules and want to consciously choose the right components, take advantage of the practical advice in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, where you will find tips on selecting, verifying, and safely installing automotive electronics from the secondary market.