S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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Remove the vacuum hose from the combination valve.
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Disconnect the Secondary Air Injection hose.
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Connect hand vacuum pump to combination valve vacuum connection.
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Inject a light air pressure into the in Secondary Air Injection hose to close the combination valve. (do not use compressed air).
‹› The combination valve should close and seal. Air should not be able to pass through the combination valve.
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Operate the hand vacuum pump.
‹› The combination valve should open. Air should be able to pass through the combination valve.
If combination valve does not open:
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Replace the faulty combination valve.
