Audi A5 S5 8T 4,2 V8 Exhaust Gas Combination Valve Left N/S 079131101AB

Audi A5 S5 8T 4,2 V8 Exhaust Gas Combination Valve Left N/S is an original component from the EGR Valves and Parts group, designed for operation in the 4.2 V8 engine exhaust gas recirculation system. Precise fitment for the Audi A5/S5 8T powertrain ensures stable operating parameters and facilitates the maintenance of correct exhaust emission values. This is a solution for users who require a part that is structurally consistent with the factory system.

Specifications and technical data

• SKU: 079131101AB
• Mark: Audi
• Condition: Used
• OEM Part Number: 079131101AB
• Substitutable numbers: 079131101AB, 079 131 101 AB
• Location on the vehicle: Left
• Category: EGR Parts & Valves

Purpose and function in the EGR system

The presented valve is designed to operate on the left side of the engine unit, in accordance with the factory layout of the 4.2 V8 engine in the Audi A5/S5 8T. It is responsible for the controlled flow of exhaust gases from the exhaust manifold to the intake manifold, which allows for the reduction of nitrogen oxides and stabilization of the combustion process across a wide range of loads.

A properly functioning EGR valve contributes to:

• maintaining correct engine operating parameters under partial load,
• reducing the emission of harmful exhaust components,
• limiting the risk of ECU errors related to exhaust gas recirculation.

Construction and fitment for Audi A5 S5 8T 4,2 V8

The left EGR valve is structurally matched to the architecture of the V8 engine used in the 8T generation Audi A5/S5. The body geometry, mounting points, and connections are prepared for installation in factory locations, which allows for the preservation of the original routing of exhaust channels and vacuum or control lines.

Thanks to this:

• installation does not require mechanical modifications within the cylinder head and manifolds,
• compatibility with the stock engine control system is maintained,
• the risk of leaks in the exhaust gas recirculation system is limited.

Operational characteristics

The item comes from an Audi vehicle and is classified as a used part, which means it was previously operated under road conditions. This type of component is a good choice for repairs where it is crucial to maintain the original design of the EGR system while optimizing service costs.

Before installation, a standard workshop procedure is recommended, including inspection of seats, flow channels, and connection tightness to ensure proper cooperation with the remaining elements of the intake and exhaust system.

Benefits of using an original EGR valve

Using an original valve from the EGR Valves and Parts group in the Audi A5/S5 8T 4.2 V8 allows for the preservation of the factory operating parameters of the powertrain. Compared to replacements, the original design ensures predictable behavior across the full range of temperatures and loads, which is important for both engine durability and controller stability.

The main advantages include:

• compliance with factory exhaust flow characteristics,
• correct fitment for the left cylinder bank in the V8 engine,
• possibility of use in repairs restoring the stock configuration of the EGR system.

Expanding the EGR system in Audi

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, hoses, or exhaust gas recirculation control elements, check the available parts in the Audi EGR Valves and Parts category.

Technical knowledge and part selection

When working with high-performance units and advanced control electronics, such as the sports variants of Audi, the proper selection of EGR components has a direct impact on engine stability and operational safety. It is worth expanding your knowledge about the structural differences between standard and sports versions by using expert materials, such as the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the specifics of powertrains and related systems.

Summary

Audi A5 S5 8T 4,2 V8 Exhaust Gas Combination Valve Left N/S is a solution intended for users who want to restore the proper operation of the exhaust gas recirculation system while maintaining the manufacturer's original design concept. Proper fitment for the left cylinder bank of the V8 engine, compatibility with factory controls, and the ability to be used in professional repairs make it a practical choice for servicing the EGR system in the Audi A5/S5 8T.