Audi A6 S6 C6 Secondary Air Pipe Hose Line 4F0133425C

Audi A6 S6 C6 Secondary Air Pipe Hose Line is an original intake system component responsible for the precise routing of secondary air within the engine. Thanks to its factory geometry and perfect fit for the C6 platform, it ensures stable engine performance parameters and proper integration with the factory control system. It is a practical solution for users who want to maintain the structural integrity of the intake system in their Audi.

Specifications and technical data

• SKU: 4F0133425C
• Mark: Audi
• Condition: Used
• OEM Part Number: 4F0133425C
• Substitutable numbers: 4F0133425C, 4F0 133 425 C
• Category: Hoses, Lines & Pipes

Purpose and technical function

The secondary air pipe in the Audi A6 / S6 C6 is responsible for transporting air within the engine supply system, in accordance with the factory secondary air injection system specifications. A correctly selected component in this section is essential for:

• maintaining proper airflow in the intake system,
• stable engine operation across various load ranges,
• maintaining compliance with factory engine control unit maps.

The original secondary air pipe is designed specifically for the engine bay geometry of the Audi A6 / S6 C6, which translates into reliable medium routing and reduced unwanted stress during operation.

Construction and fitment for Audi A6 / S6 C6

The component belongs to the Lines, hoses, and pipes group, meaning it has been engineered to operate in environments with elevated temperatures and variable pressure conditions. The shape and mounting points are adapted to factory brackets and routings in the engine bay, which facilitates installation and subsequent maintenance.

Choosing the original secondary air pipe allows for maintaining the consistency of the entire intake system without the need to modify adjacent components. This is particularly important when working with stock engine equipment, where every element is designed as part of a larger system.

Benefits of using the original secondary air pipe

Using a secondary air pipe dedicated to the Audi A6 / S6 C6 brings a number of practical operational benefits:

• Factory fitment – compatibility with the original intake system geometry and mounting points on the chassis.
• Consistency with the engine control system – the pipe works seamlessly with factory airflow solutions.
• Easy installation – no need for modifications, cutting, or adapting universal replacements.
• Predictable system behavior – maintaining performance characteristics close to the factory configuration.

For users who prioritize technical correctness and want to avoid experimenting with random replacements, such a component is a sensible choice for repairs and inspections of the intake system.

Component condition and service application

The offered secondary air pipe is a component removed from a vehicle, which allows it to be used as a service part in Audi A6 / S6 C6 vehicles requiring replacement of this section of the system. This type of component will prove useful both for standard repairs and for restoring a vehicle to a configuration close to factory specifications after previous modifications.

Due to its purpose, the secondary air pipe is particularly useful in situations where the existing element has suffered mechanical damage, leaks, or deformation resulting from long-term operation at high temperatures.

System expansion and related components

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 flexible intake sections, rigid guide pipes, or additional auxiliary hoses, check out the available parts in the Audi lines, hoses, and pipes category.

For users interested in a broader approach to engine equipment maintenance in other brands, including popular premium models, practical tips on operation and service may also be useful – you can find them in the article Reliability under the star sign – how to take care of engine equipment in Mercedes-Benz C and E class, which discusses the approach to selecting and replacing key engine components.