A6 Quattro Sedan V6-3.0L (AVK) (2002)
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Disconnect vacuum hose to brake booster (arrows).
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Remove heat shield for harness connectors at left of bulkhead.
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Remove harness connectors -1 to 4- from bracket at left of bulkhead.
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Disconnect electrical harness connectors -1- and -4-.
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Guide wires to the oxygen sensors downward.
Vehicles with automatic transmission 01J:
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Unscrew oxygen sensor behind catalytic converter (arrow) using special tool 3337.