Audi S4 B8 3.0 TFSI CGWC 333HP Engine ECU Kit 4H0907401 Ignition + 2 Keys + Lock

Audi S4 B8 3.0 TFSI CGWC 333HP Engine ECU Kit is a factory electronic control unit designed for precise management of the 3.0 TFSI engine in the B8 generation S4 model. It offers stable control of engine parameters, ensuring consistency with the vehicle's original electrical architecture. This is a solution for users who expect compatibility with the factory configuration and predictable powertrain behavior.

Specifications and technical data

• SKU: 4H0907401-3
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0907401
• Substitutable numbers: 4H0907401, 4H0 907 401, 0281016910, 0 281 016 910, 4H0907064CB, 4H0 907 064 CB, 4H0905852C, 4H0 905 852 C
• Category: ECUs & Computer Modules

Technical characteristics and purpose

The presented controller belongs to the Electronic control modules and controllers group and has been designed specifically for the 3.0 TFSI CGWC 333HP engine in the Audi S4 B8. As an OEM Audi component, it works with the factory wiring, sensors, and engine peripherals, which reduces the risk of communication issues within the CAN network and other vehicle modules. The engine ECU in this model is responsible for, among other things:

• managing fuel injection and ignition in the 3.0 TFSI unit,
• coordinating boost pressure and protecting the engine from overloading,
• communicating with other controllers in the vehicle (e.g., transmission, safety systems),
• handling startup strategies, cold-start operation, and adaptation under various operating conditions.

Benefits of using an original Audi ECU

Using an original engine computer in the Audi S4 B8 allows for maintaining consistency of software and operating parameters with the manufacturer's factory specifications. This is particularly important in higher-power vehicles, where control precision affects the durability of the powertrain and performance stability. Key advantages of this solution include:

• factory control logic tailored to the 3.0 TFSI CGWC engine,
• preservation of original engine maps and protection strategies,
• easier diagnostics using standard service tools,
• greater predictability of vehicle behavior compared to universal replacements.

Condition and service application

This item comes from the group of used electronic control modules, which allows for cost-effective repair of the engine control system while maintaining the original specification. This type of ECU is often chosen in cases of:

• damage to the factory controller due to power surges or electrical system failure,
• communication problems between the engine controller and other modules,
• the need for ECU replacement as part of advanced fault diagnostics. Before installation, adaptation and programming procedures appropriate for the specific vehicle must be followed to ensure full compatibility with the immobilizer and other systems.

Integration with vehicle electronics and diagnostics

As an item in the Electronic control modules and controllers category, the Audi engine computer works with an extensive network of modules responsible for safety, comfort, and the drivetrain. A correctly selected controller facilitates diagnostic work, enabling error reading, logging of live parameters, and performing adaptations using specialized service software. For more advanced work with vehicle electronics, including multimedia systems and engine controllers in other brands, it is worth checking out the guide material describing a practical approach to iDrive modules and controllers in BMW – this is detailed in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?, which demonstrates universal principles for working with automotive electronics.

Expanding Audi electronics upgrades

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 additional controllers, drivetrain management modules, or auxiliary systems, check the available parts in the Audi electronic control modules and controllers category. This allows you to plan work on the drivetrain electronics in one stage, reduce vehicle downtime, and ensure a consistent configuration of all interacting modules.