Allroad Quattro V8-4.2L (BAS) (2004)
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Detach 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).
Vehicle diagnostic, testing and information system VAS 5051 connected up; 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 001, key, until the secondary air injection (AIR) solenoid valve -N112- is activated.
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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.
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Turn the ignition off.
If valve does not open or close properly:
