S4 V8-4.2L (BHF) (2004)
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Remove front engine cover (arrows -1- and -2-).
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Move lock carrier to service position.
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Disconnect hoses from Secondary Air Injection (AIR) solenoid valve - N112- (arrow); leave connector attached.
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Connect test hose to valve connection marked with arrow.
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Vehicle diagnostic, testing and information system VAS 5051 connected; vehicle self diagnosis and vehicle system "01.Engine electronics"
selected. Ignition must be on.
Indicated on VAS 5051:
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From list -1- select diagnostic function "03. Final control diagnosis".
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Keep touching - key until Secondary AIR solenoid valve -N112- is actuated.
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Valve must click...
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...and must open and close (can be checked by blowing into test hose).
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Terminate function "03. Final control diagnosis" by touching - key.
If valve does not open or close properly:
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Replace Secondary AIR solenoid valve -N112-.