Combination valve for secondary air injection (AIR), checking function and for leaks

WARNING: This page is about a different car, the 2010 Audi A8, 2009 Audi A8, 2008 Audi A8, and 2007 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.

Work procedure

Hose connections properly sealed.

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Pull rear engine cover - arrows - off.

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Disconnect air guide hose - 3 - from Secondary Air Injection (AIR) combi-valve.

NOTE:

The left combination valve for Secondary Air Injection (AIR) is depicted in the illustration.
Ignore items - 1 and 2 -.

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Connect an assisting hose - arrow - to Secondary Air Injection (AIR) combi-valve.
Blow into assisting hose using light pressure (do not use pressurized air).

Secondary Air Injection (AIR) combi-valve must be closed, it must not be possible to blow through.

Blow into assisting hose using higher pressure (do not use pressurized air).

The Secondary Air Injection (AIR) combi-valve must open, it must be possible to blow through.

If switching point is not recognized:

Replace Secondary Air Injection (AIR) combi-valve: Left → Left combination valve for Secondary Air Injection, removing and installing , right → Right combination valve for Secondary Air Injection, removing and installing .