A8 Quattro Sedan V8-4.2L (BGK) (2006)
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Disconnect pressure hose - 2 - at Secondary Air Injection (AIR) pump motor and blow air in with light pressure (do not use pressurized air).
‹› Both combination valves must be closed, it must not be possible to blow through hose
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Operate hand vacuum pump.
‹› The relevant combination valve must open, it must be possible to blow through
If respective combination valve does not open:
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Replace combination valve, refer to Repair Information.
