S4 Quattro Wagon V8-4.2L (BHF) (2008)
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Take connectors - 1 - to - 4 - out of holder on right of bulkhead.
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Disconnect connector - 2 -.
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Lay free the oxygen sensor probe wiring.
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Remove Heated Oxygen sensor (HO2S) - arrow - using Support Tool (3369).
‹› Illustration shows engine removed.
Installing