Combination valve for Secondary Air Injection (AIR), checking function and for proper seal

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 Audi S4, 2008 Audi S4, 2007 Audi S4, 2006 Audi S4, and 2005 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Identifying Hand Vacuum Pump VAS 6213

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Hand vacuum pump VAS 6213

Test conditions

Vacuum lines and hose connections free of leaks.
Vacuum lines not plugged.

Test sequence

Fig 2: Removing Rear Engine Cover

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Remove rear engine cover - arrows -.

Fig 3: Removing Cover In Engine Compartment (Right Side)

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Remove cover - 1 - in engine compartment (right side).

Fig 4: Identifying Evaporative Emission Canister Purge Regulator Valve N80 And Air Duct

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Disengage Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 - 1 - from air guide.
Remove bolts - arrows -.
Remove air duct - 2 -.

Fig 5: Removing Air Guide Hose

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Remove air guide hose - arrows -.

Fig 6: Disconnecting Vacuum Hose At Combination Valve To Be Tested

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Disconnect vacuum hose - arrow - at combination valve to be tested.

NOTE:

Left combination valve is shown in illustration.

Connect hand vacuum pump VAS 6213 to vacuum hose of combination valve to be checked.

Fig 7: Disconnecting Hose For Secondary Air Injection (AIR) Pump At Air Filter Housing

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect hose - arrow - for Secondary Air Injection (AIR) pump at air filter housing, press release buttons to do so.
Blow with light pressure into pipe (do not use pressurized air).

Both combination valves must be closed, it must not be possible to blow through hose.

Operate hand vacuum pump.

The relevant combination valve must open, it must not be possible to blow through

If relevant combination valve does not open:

Replace combination valve: Left → Left combination valve for Secondary Air Injection, removing and installing , right → Right combination valve for Secondary Air Injection, removing and installing .