A4 V6-3.0L (AVK) (2004)
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Remove bolt (arrow) and disconnect air duct -2- at throttle valve control module.
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Disconnect hose -1- from air duct.
NOTE: Illustration depicts air guide from rear with the engine removed.
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Remove harness connectors -1- to -4- from bracket at right of bulkhead.
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Disconnect electrical harness connectors -1- and -4-.
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Move wires to oxygen sensors clear.
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Unscrew oxygen sensor behind catalytic converter (arrow) e.g. using special tool 3337/7.
NOTE: Illustration is shown with engine removed.