Audi R8 42 RS4 B7 4.2 FSI Adapter Combination Valve Left N/S 079131166D

Audi R8 42 RS4 B7 4.2 FSI Adapter Combination Valve Left is a precision component from the EGR valves and parts group, designed to operate in the demanding conditions of the exhaust and exhaust gas recirculation system. A properly selected combination valve adapter helps maintain stable operating parameters of the 4.2 FSI unit, reduce the risk of ECU errors, and ensure predictable exhaust flow characteristics on the left side.

Specifications and technical data

• SKU: 079131166D
• Mark: Audi
• Condition: Used
• OEM Part Number: 079131166D
• Substitutable numbers: 079131166D, 079 131 166 D
• Location on the vehicle: Left
• Category: EGR Parts & Valves

Purpose and function in the EGR system

The combination valve adapter on the left side is responsible for the proper connection of the exhaust gas recirculation system elements with other engine auxiliary components. In 4.2 FSI engines used in Audi R8 42 and RS4 B7 models, it is significant for:

• stable exhaust gas routing in the area of the left cylinder bank,
• maintaining proper cooperation of the valve with the manifold and exhaust channels,
• preserving tightness and appropriate flow geometry,
• reducing turbulence that may affect sensor readings and engine control strategy. Thanks to its proper design, the adapter supports the correct operation of the EGR system, which translates into smooth engine operation and predictable responses to load.

Construction, fitment, and positioning

The presented element is dedicated to installation on the left side of the vehicle, which is crucial when selecting parts for V-engines. The appropriate shaping of connections and mounting points allows for:

• trouble-free fitment with factory engine equipment,
• maintaining the correct position of the combination valve relative to the exhaust channels,
• preserving the original exhaust routing in the system. As an element from the EGR valves and parts group, the adapter has been designed to work with the factory architecture of the 4.2 FSI unit, without the need for interference in the system's construction.

Benefits of using an original Audi component

Choosing a combination valve adapter from the Audi brand primarily ensures a precise fit for the specific engine configuration. In practice, this means:

• maintaining factory exhaust flow parameters in the area of the left bank,
• reduced risk of leaks and improper installation,
• better cooperation with existing sensors and EGR control. The used element allows for an economical repair while maintaining the original design specification, which is particularly important in advanced FSI units with high power density.

Using a used adapter in repairs

When repairing the exhaust gas recirculation system in 4.2 FSI engines, it is often crucial to restore the original flow geometry and position of the combination valve. A used adapter can be a rational choice when:

• the existing element has suffered mechanical damage or corrosion,
• replacement is necessary due to leaks within the connections,
• errors related to the operation of the EGR system on the left side appear. More about when using used components makes technical sense, how to assess their condition, and how to plan the scope of service work can be found in the article Operational faults and costs: how to repair a car using used auto parts?.

Expanding EGR system service in Audi

If you are planning a comprehensive repair or upgrade of the exhaust gas recirculation system area in your Audi and need other elements from the same group, such as EGR valves, exhaust pipes, or additional adapters, check the available parts in the Audi EGR valves and parts category.