S4 V8-4.2L (BHF) (2004)
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Unfasten clamps (arrows) and remove air hose.
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Take connectors -1 ... 4- out of holder on right of bulkhead.
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Disconnect connectors -2- and -4-.
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More oxygen sensor wiring downward and clear.
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Remove front right wheel.
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On vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of auxiliary/additional heater at sound insulation.
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Unfasten quick-release fasteners -1-, remove bolts -2- and remove sound insulation.
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Remove holder for sound insulation (arrows).
Note: To avoid damage, do not kink the decoupling element in the front exhaust pipe by more than 10°.