Audi A4 S4 B8 3.0 TFSI 333HP CAKA Quattro Engine Control Unit ECU 8K0907551

Audi A4 S4 B8 3.0 TFSI 333HP CAKA Quattro Engine Control Unit ECU is a factory electronic control unit designed for 3.0 TFSI petrol engines with Quattro all-wheel drive and a manual transmission. This component from the Electronic control modules and controllers group is responsible for precise engine management, ensuring stable performance and proper integration with other vehicle systems. This used controller is a solution that allows for a technically sound repair while maintaining a favorable cost-to-functionality ratio.

Specifications and technical data

• SKU: 8K0907551
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0907551
• Substitutable numbers: 8K0907551, 8K0 907 551, 5WP46405
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The presented engine control unit is designed to work with the 3.0 TFSI petrol engine with 333 HP in Audi A4 / S4 B8 generation models with Quattro drive and a manual transmission. The ECU is responsible for:

• controlling fuel injection and ignition in the petrol engine,
• managing boost pressure and engine protection strategies,
• communicating with other vehicle modules via data buses,
• supporting OBD diagnostic functions and error logging.

Thanks to this, a properly selected ECU allows for restoring correct engine operation after a failure of the previous controller or following modifications that require a module replacement.

Benefits of using an original ECU

Using an original engine control unit in an Audi A4 / S4 B8 provides a range of practical operational benefits:

• Full integration with the vehicle's electrical system – compatibility with the factory wiring harness, sensors, and engine peripherals.
• Stable engine operation – correct control maps for the 3.0 TFSI engine and Quattro drive.
• Proper fit for manual transmission – correct cooperation with drivetrain management systems.
• Possibility of adaptation and coding in accordance with Audi service procedures.

For the user, this means predictable vehicle behavior, correct throttle response, and proper operation of safety and comfort systems that depend on the engine control unit.

Technical characteristics and compatibility

The engine control unit belongs to the Electronic control modules and controllers group, meaning it is a central component for the operation of the powertrain. In practice, when selecting this ECU, it is crucial to consider:

• matching the specific 3.0 TFSI CAKA engine version,
• compatibility with the Quattro drive configuration,
• fuel type – petrol,
• selection for a manual transmission.

Before purchasing, it is worth verifying the compatibility of the controller with the vehicle's configuration and planning its programming or adaptation at a specialized service center to ensure all systems function correctly.

Product condition and practical application

The offered ECU is a used component, which in the case of automotive electronics often represents a reasonable compromise between cost and functionality. This type of controller works well both as a replacement for a damaged module and as a base for further configuration in service or tuning projects, provided they are carried out according to the manufacturer's procedures. A properly selected and prepared engine control unit allows for restoring full powertrain efficiency without the need for mechanical intervention in the engine itself.

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

How to consciously choose a used engine control unit

When purchasing a used ECU for an Audi A4 / S4 B8, it is worth paying attention to compatibility with the vehicle configuration, the possibility of correct coding, and the module's origin history. It is also good practice to consult with an automotive electrician or diagnostician who can confirm the possibility of adapting the controller to a specific vehicle. To better understand when choosing a used engine control unit is justified and how to minimize risks, it is worth reading our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.