Audi S4 B7 Secondary Air Pump Unit Pressure Hose Pipe Line 4.2 Petrol 8E0133817E

Audi S4 B7 4.2 Petrol Secondary Air Injection Hose is an original part from the Hoses, Tubes & Pipes group, designed for operation in the demanding engine bay environment. Engineered by Audi to work with the secondary air pump in a 4.2 petrol engine, it ensures a sealed and stable air flow during cold start.

Specifications and technical data

• SKU: 8E0133817E
• Mark: Audi
• Condition: Used
• OEM Part Number: 8E0133817E
• Substitutable numbers: 8E0133817E, 8E0 133 817 E
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Application in the Audi S4 B7 Secondary Air System

The presented hose is a component of the secondary air injection system in the Audi S4 B7 generation with a 4.2 petrol engine. It is responsible for transporting compressed air from the secondary air pump to further sections of the system, supporting exhaust afterburning during engine warm-up. A correctly selected pressure hose reduces the risk of leaks, engine control unit errors, and reduced exhaust emission system efficiency.

Construction and Technical Characteristics

The hose is designed as an OEM part, geometrically matched to the Audi S4 B7 engine bay. Its shape, diameter, and mounting points are adapted to the factory routing of the system, facilitating installation and maintaining the original pressure line path. The hose's construction is prepared to handle hot air and typical mechanical loads found around a high-performance petrol engine.

Thanks to its factory design, the hose works with original connectors and brackets, which reduces stress, minimizes the risk of abrasion, and simplifies servicing. This solution is beneficial for both repairing an existing system and restoring full functionality in youngtimer-class vehicles.

Benefits of Using an Original Pressure Hose

Using an original pressure hose in the secondary air system offers a range of practical benefits:

• maintaining factory-level sealing of the secondary air system,
• stable cooperation with the secondary air pump and other system components,
• reducing the risk of diagnostic errors related to air flow,
• easier diagnostics and servicing due to compliance with manufacturer documentation,
• preserving the original routing of hoses in the engine bay.

A part from the Hoses, Tubes & Pipes group, selected according to factory specifications, allows for predictable system operating parameters and simplifies subsequent service work.

Condition, Origin, and Service Purpose

The hose is a used part, removed from a vehicle, and offered as a pre-owned component. This is a sensible choice for servicing specialized systems in vehicles like the Audi S4 B7. A used OEM part helps maintain the vehicle's structural integrity while reducing repair costs compared to new aftermarket replacements. This solution is particularly attractive for long-term ownership of cars with large-displacement petrol engines.

Support for Upgrades and Additional Materials

If you are planning a comprehensive engine bay repair or upgrade for your Audi and need other parts from the same group, such as vacuum hoses, air hoses, or intake pipes, check the available parts in the Audi Hoses, Tubes & Pipes category.

For owners of youngtimers who want to make informed use of pre-owned components and better plan their car's refresh, an article describing practical upgrade scenarios and parts selection may be helpful – you can find it here: Second Life for Youngtimers – How Used Car Parts Revitalize Cars from 1998–2012.