Audi A5 S5 8T 4.2 V8 FSI CAUA Secondary Air Kombi Valve Left N/S 079131101L

Audi A5 S5 8T 4.2 V8 FSI CAUA Secondary Air Kombi Valve Left N/S is an original secondary air injection system component, designed for installation on the left side of the 4.2 V8 FSI CAUA engine unit. Thanks to its factory design, it ensures proper airflow control within the system, which promotes stable engine operation and compliance with exhaust emission requirements. This solution is dedicated to users who expect precise fitment and the maintenance of factory engine performance parameters.

Specifications and technical data

• SKU: 079131101L
• Mark: Audi
• Condition: Used
• OEM Part Number: 079131101L
• Substitutable numbers: 079131101L, 079 131 101 L
• Location on the vehicle: Left
• Category: Other Air & Fuel Delivery

Purpose and technical function

The presented valve is a component of the secondary air pump system in Audi A5 and S5 8T generation models with the 4.2 V8 FSI CAUA engine. Its task is to control the opening and closing of secondary airflow directed to the exhaust system during the engine start-up and warm-up phase. A properly functioning valve supports:

• stable combustion conditions during the initial phase of engine operation,
• maintenance of appropriate exhaust emission parameters,
• correct cooperation with the engine control electronics.

The placement on the left side of the vehicle is significant from the perspective of installation compatibility – the valve has been designed for specific hose routing, mounting shapes, and engine bay geometry.

Compatibility and fitment for Audi A5 / S5 8T

The Secondary Air Kombi Valve Left N/S is structurally matched to the architecture of the 4.2 V8 FSI CAUA engine, which allows for the preservation of factory hose routing and mounting points. Original Audi group origin means:

• compatibility with serial engine control and OBD diagnostics,
• no need for installation modifications,
• maintenance of factory secondary air system performance parameters.

For users who care about the technical integrity of the vehicle, this is a solution that allows for the replacement of a worn component without interfering with the engine unit's construction.

Characteristics of the used component

The offered valve comes from disassembly and is a used part, which represents a favorable compromise between cost and maintaining original manufacturing quality. This type of part is particularly attractive when servicing specialized units such as the 4.2 V8 FSI, where factory components are valued for their fitment and durability. Choosing a used OEM component allows for reduced expenses while maintaining consistency with other system sub-assemblies.

Benefits of using the original secondary air valve

Using the dedicated left-side valve in the Audi A5 / S5 8T brings a range of practical operational benefits:

• Factory fitment – preservation of original mounting geometry and air hose routing.
• Consistent operation with engine electronics – correct control and diagnostics without errors resulting from part incompatibility.
• Support for the exhaust emission system – proper secondary airflow during critical engine operation phases.
• Reasonable service cost – used OEM component as an alternative to new aftermarket replacements.

Service expansion and selection of 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 additional valves, air hoses, or secondary air system mounts, check the available parts in the Other Audi category.

For drivers interested in a broader look at the structural differences between sports versions and standard models, including solutions in the engine, brakes, and chassis, the article Audi RS vs other models – what is hidden under the hood and chassis? will be helpful, allowing for a better understanding of the brand's design philosophy and enabling informed planning of further modifications or service.