Audi A4 S4 B9 3.0 TFSI 355HP CWGD Quattro Engine Control Unit ECU 06M907309D

Audi A4 S4 B9 3.0 TFSI 355HP CWGD Quattro Engine Control Unit ECU is a specialized electronic control module designed for gasoline engines paired with an automatic transmission. This component from the Electronic control modules and controllers group is responsible for precise engine management, ensuring stable performance and proper integration with the Quattro drivetrain.

Specifications and technical data

• SKU: 06M907309D
• Mark: Audi
• Condition: Used
• OEM Part Number: 06M907309D
• Substitutable numbers: 06M907309D, 06M 907 309 D, 0261S14655, 0 261 S14 655
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The presented control unit is dedicated to Audi powertrains with a 3.0 TFSI gasoline engine and all-wheel drive, integrated with an automatic transmission. The ECU manages key engine operating parameters, such as fuel injection, ignition timing, and communication with onboard systems, which translates into smooth acceleration, predictable throttle response, and stable operation across the full load range.

Thanks to its factory architecture, the ECU maintains compatibility with the vehicle's original electrical installation, facilitating integration with the existing wiring harness, sensors, and other electronic modules in the car.

Benefits of using an original ECU module

Using an original control unit in an Audi S4 B9 allows for maintaining software and hardware consistency throughout the entire powertrain. This is particularly important in vehicles with Quattro drive and automatic transmissions, where communication between modules occurs in real-time. A properly selected ECU:

• supports the correct operation of the gasoline engine in various driving modes,
• ensures compatibility with factory safety and comfort systems,
• reduces the risk of CAN bus communication errors and diagnostic issues.

For the user, this means stable performance, predictable vehicle behavior, and easier maintenance in the future.

Technical characteristics in the context of the powertrain

The controller has been designed to work with a gasoline-powered engine, which is significant for injection maps, ignition strategies, and exhaust emission system management. At the same time, the module is adapted to work with an automatic transmission, allowing it to exchange data with the transmission control module, supporting smooth gear shifts and appropriate powertrain response to load.

This combination of parameters makes the controller an essential component in higher-power vehicles, where control precision has a direct impact on engine refinement, dynamics, and component durability.

Condition, selection, and installation aspects

The offered module comes from the secondary market, which allows for an economical restoration of the engine control system while maintaining the original specification. Before purchasing, it is worth verifying compatibility using the OEM part number and interchangeable numbers, as well as comparing hardware and software markings with the controller currently installed in the vehicle.

In practice, ECU installation usually requires:

• checking compatibility with the specific engine and transmission configuration,
• considering adaptation or coding procedures for the vehicle,
• performing diagnostics after installation to confirm proper communication with other modules.

Expert support and selection of used electronics

When choosing a used engine control unit, correct matching by part numbers and understanding the differences between hardware and software versions is crucial. A detailed discussion of selection principles, compatibility issues, and practical examples can be found in the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

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