S4 V8-4.2L (BHF) (2004)
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Remove electrical harness connectors - 1 through 4 - from bracket at left of bulkhead.
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Disconnect electrical connectors - 1 - and - 4 -.
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Free up oxygen sensor wiring.
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Remove the connector bracket.
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Remove nut - 2 - which is accessible from top for left exhaust pipe/exhaust manifold.
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For the sake of illustration, shown with engine removed.
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The nuts - 1 - and - 3 - underneath will be removed later.
All Vehicles
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Remove left front wheel.
