Audi TTRS 8J 2.5 TFSI CEPA Quattro 340HP Engine Control ECU 8J0907404 Manual

Audi TTRS 8J 2.5 TFSI CEPA Quattro 340HP Engine Control ECU is a specialized electronic control module designed for the petrol engine unit paired with a manual transmission. As a component from the Electronic control modules and ECUs category, it is responsible for precise engine management, ensuring stable performance and predictable drivetrain behavior.

Specifications and technical data

• SKU: 8J0907404
• Mark: Audi
• Condition: Used
• OEM Part Number: 8J0907404
• Substitutable numbers: 8J0907404, 8J0 907 404, 0261S02601, 0 261 S02 601
• Fuel type: Petrol
• Gearbox type: Manual
• Rim width: 8
• Category: ECUs & Computer Modules

Purpose and function of the ECU

The presented ECU is designed to work with the five-cylinder 2.5 TFSI engine in the TTRS version, in a configuration with Quattro all-wheel drive and a manual transmission. It is responsible for controlling fuel injection, ignition, engine auxiliary systems, and communication with other vehicle systems, which translates into consistent operation of the entire drivetrain.

Thanks to dedicated software, the ECU is optimized for the characteristics of a high-power engine, ensuring repeatable performance parameters under dynamic driving conditions. Using an original module allows for maintaining factory control logic, which is particularly important for cars used both daily and in sports applications.

Drivetrain compatibility

The ECU is intended for a petrol engine, meaning its control map, injection and ignition strategies, and protection algorithms are adapted to the specifics of a petrol-powered unit. In combination with a manual transmission, it ensures consistent operation of functions such as torque control, throttle response, and interaction with electronic stability control systems.

In practice, this means that with proper selection for a specific vehicle configuration, you can achieve:

• stable engine operation across the full rev range,
• proper interaction with the Quattro drivetrain,
• maintenance of factory safety and engine protection strategies.

Application in service and motorsport

Due to the characteristics of the TTRS model, this ECU is used both in standard service repairs and in projects with higher requirements, where repeatability of engine performance parameters is key. Replacing the ECU with an original module from the same family reduces the risk of communication issues within the vehicle network and facilitates configuration using factory diagnostic tools.

In the case of mechanical or software modifications, having the correct base ECU is essential for proper engine tuning, especially in cars used on the track or in intensive road driving.

Condition and benefits of choosing a used ECU

The offered module comes from the secondary market, which allows for significantly reducing repair costs compared to purchasing a new component, while maintaining the manufacturer's original specifications. A used ECU is a good solution in situations where the existing ECU has suffered electronic damage, there are communication problems in the vehicle network, or errors appear that cannot be cleared by standard diagnostics.

To better plan the selection and installation of such a component, it is worth checking out our guide on electronic modules – it discusses in detail issues of compatibility, selection by part numbers, and adaptation procedures: Used automotive electronics – a guide to selecting ECU modules and sensors.

Support for selection and drivetrain 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, auxiliary modules, or drivetrain management systems, check out the available parts in the Electronic control modules and ECUs for Audi category.

For those considering further modifications to the engine or the entire drivetrain using second-hand components, a practical article on the pitfalls of buying used tuning parts may also be helpful: most common mistakes when choosing used tuning parts.