Audi RS4 B8 Secondary Air System Valve Adapter 4.2 FSI CFSA 07L131119

Audi RS4 B8 Secondary Air System Valve Adapter 4.2 FSI CFSA is an original air supply system component designed for the RS version of the V8 FSI engine. Thanks to its factory design, it ensures proper operation of the secondary air injection system, which supports engine performance and stable exhaust emission parameters. This used OEM component is a sensible choice for servicing advanced Audi RS units, where fitment and predictable behavior under load are essential.

Specifications and technical data

• SKU: 07L131119
• Mark: Audi
• Condition: Used
• OEM Part Number: 07L131119
• Substitutable numbers: 07L131119, 07L 131 119
• Category: Other Engine Parts

Purpose and function of the secondary air valve

The secondary air valve in the 4.2 FSI CFSA engine is responsible for the controlled supply of additional air to the exhaust system during specific engine operating phases. In practice, this translates into:

• more efficient combustion of the mixture in the exhaust system during cold starts,
• more stable operation of emission control systems,
• more predictable engine behavior in dynamic modes.

For high-performance RS4 B8 units, a properly functioning secondary air valve is crucial for maintaining factory operating parameters and reducing the risk of error codes stored in the engine control unit.

Benefits of using an original Audi component

Choosing an original Audi secondary air valve allows you to maintain compliance with the factory specifications of the 4.2 FSI unit. This means, among other things:

• reliable fitment to manifolds and air/exhaust system lines,
• correct air flow characteristics consistent with CFSA ECU maps,
• maintaining the stock logic of the secondary air system without the need for software modifications.

For Audi RS4 B8 owners who want to keep their vehicle in a configuration close to factory standards, using such a component is particularly beneficial during comprehensive engine service or when restoring full functionality after encountering air system-related errors.

Condition, verification, and service application

The presented valve comes from a group of used Audi parts, which allows for repair cost optimization while maintaining the original design. This type of component is often replaced in situations where:

• diagnostic errors related to secondary air flow occur,
• problems with cold starts or rough idling during the initial phase appear,
• replacement of a damaged valve is necessary after interventions in the exhaust or intake system.

Selecting a used secondary air valve is particularly important for high-power units such as the RS4 B8, where the stability of engine operating parameters has a direct impact on the durability of other components.

Integration with the 4.2 FSI CFSA engine system

The secondary air valve works with the engine control system, sensors, and exhaust components to create a cohesive air flow control system. In practice, this means:

• coordination with ECU maps responsible for the engine warm-up phase,
• interaction with lambda sensors and the catalytic converter system,
• influence on the speed at which the exhaust system reaches operating temperature.

When replacing this component, it is important to maintain the correct installation sequence and connection tightness so that the secondary air system can operate fully in accordance with the design assumptions of the RS unit.

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 valves, vacuum lines, or intake system elements, check out the available parts in the Other Audi category.

Technical support and knowledge about Audi RS models

For RS model owners who want to better understand the design differences between sports versions and standard ones, material describing the specifics of engines, brakes, and chassis will be useful. To this end, it is worth reading the article Audi RS vs other models – what is hidden under the hood and chassis?, which helps in consciously planning service and selecting parts for advanced Audi units.