A8L V8-4.2L (BFM) (2004)
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Air Injection Control Valve: Service and Repair
Combination Valve (Left), Removing and Installing
Combination valve (left), removing and installing
Removing
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Open quick-release fasteners -1- and -2- and lift off engine cover panel (arrows).
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Unscrew bolts -1-.
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Release hose clamps -2-.
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Remove bolt and nuts (arrows).
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Disconnect electrical connectors -3- from both mass air flow sensors and pull off air cleaner housing from above.
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Disconnect both air ducts going to lock carrier.
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Unscrew bolt -1-. - Remove crankcase breather pipe (arrows).
Note: Illustration shows engine from the rear.
