Audi RS4 B8 4.2 FSI CFSA Petrol Air Filter Pipe Line Hose Tube 8K0133817B

The Audi RS4 B8 4.2 FSI CFSA vacuum connecting pipe is an original equipment vacuum system component, designed for the CFSA petrol engine. This used aftermarket part allows for a cost-effective yet professional repair of the factory vacuum control system in the Audi RS4 B8 4.2 FSI.

Specifications and technical data

• SKU: 8K0133817B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0133817B
• Substitutable numbers: 8K0133817B, 8K0 133 817 B
• Fuel type: Petrol
• Category: Air Bypass Valves

Purpose and function of the vacuum hose

The vacuum connecting pipe operates in the vacuum control system of the CFSA gasoline engine, responsible for the stable transfer of vacuum pressure between control elements. A properly functioning pipe helps maintain the proper operating parameters of the 4.2 FSI engine, affecting its smooth operation, throttle response, and the proper functioning of associated components.

This element is particularly important in high-power engines, where tightness and proper vacuum management are important for repeatable performance and limiting irregularities in the operation of the drive unit.

Benefits of using the original Audi cable

Choosing the original vacuum hose for the Audi RS4 B8 4.2 FSI CFSA ensures:

• Factory geometric fit – the correct shape and diameter of the cable facilitates installation at the standard mounting points.
• Vacuum system compatibility – the hose is designed to work with a specific CFSA engine configuration.
• Stable operating parameters – maintaining appropriate flow and tightness of the vacuum system.
• Seamless integration with bypass valves – compatible with the equipment category to which the component belongs.

This makes the cable a practical solution both for routine repairs and for restoring full system efficiency in dynamically operated cars.

Status, origin and practical application

This vacuum hose is used, reducing repair costs while maintaining the original manufacturer's specifications. It comes from a dismantled vehicle with a CFSA petrol engine, confirming its intended use for this specific engine.

This solution is particularly beneficial when:

• the existing cable shows leaks or mechanical damage,
• there are problems with the operation of vacuum-controlled elements,
• it is necessary to restore the standard system configuration in the Audi RS4 B8 4.2 FSI.

Bypass Valves and Vacuum System – Technical Context

This hose is classified as a bypass valve, emphasizing its role in the flow and pressure control system of a gasoline engine. A functioning vacuum system supports the proper operation of many auxiliary components, while a leak can lead to a drop in performance, unstable engine speed, or errors stored in the engine control unit.

For complex exhaust gas and fuel-air mixture control systems, it's also worth exploring the topic of exhaust gas recirculation. For more information, see "EGR: What Is It and Why You Should Consider Used EGR Valves ," which discusses the importance of components responsible for emissions and engine efficiency.

Other bypass valves for Audi - upgrades and service

If you're looking for other bypass valves for Audi to provide comprehensive vacuum system and engine accessories, check out our dedicated category: bypass valves for Audi . This allows you to select components from the same functional group, optimize service, and maintain consistency across the technical solutions.

Summary

The Audi RS4 B8 4.2 FSI CFSA vacuum connecting pipe is a practical choice for users who want to restore the proper operation of the vacuum system in their CFSA petrol engine using an original component from a disassembly. Proper fit, compliance with the bypass valve category, and originating from a vehicle of the same engine family make this solution technically safe and economically viable.