Secondary Air Combination Valves, Checking Function And Leaks

WARNING: This page is about a different car, the 2012 Audi Q5 and 2011 Audi Q5. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Hand Vacuum Pump VAS6213

Procedure

Fig 1: Identifying Engine Covers

Courtesy of AUDI OF AMERICA, LLC

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

-- Remove the engine covers in direction of -arrows-.

-- Remove the left and right vacuum hose -1 and 2- on the combination valve being checked.

Fig 2: Identifying Left And Right Vacuum Hoses

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-- Connect the Hand Vacuum Pump VAS6213 to the vacuum hose for the combination valve to be checked.

-- Remove the front secondary air hose -arrow- from its bracket and disconnect it; do to so press the release buttons.

Fig 3: Identifying Front Air Hose -Arrow-

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-- Blow into the Secondary Air Injection (AIR) hose using light pressure (do not use compressed air).

The AIR combination valves must be closed. It must not be possible to blow through.

-- Operate hand vacuum pump.

The relevant combination valve must open, it must be possible to blow through.

-- If the AIR combination valve does not open, replace it: for the left side, refer to LEFT COMBINATION VALVE, REMOVING AND INSTALLING or RIGHT COMBINATION VALVE, REMOVING AND INSTALLING .

Assembling

Assemble in reverse order of disassembling. Note the following:

NOTE:

The hose connections as well as the air guide pipes and hoses must be free of oil and grease before installing.

Secure all hose connections with hose clamps of the same type as those equipped by the factory .

In order to be able to securely mount the air guide hoses on their connectors, spray the screws on the previously used clamps with a rust remover.

-- Install the tower brace, refer to TOWER BRACE, REMOVING AND INSTALLING .