A6 Quattro Wagon V6-3.0L (AVK) (2002)
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Loosen mounting parts -1 to 4- and remove noise insulation.
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Disconnect pressure hose -1- at Secondary Air Injection (AIR) Pump Motor and blow into it with light pressure (do not use pressurized air).
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Both combination valves must be closed, it must not be possible to blow through hose
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Operate hand vacuum pump.
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The relevant combination valve must open, it must not be possible to blow through
If the relevant combination valve does not open:
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Replace combination valve.
