S4 Quattro Wagon V8-4.2L (BHF) (2008)
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Seal connection using a plug that fits.
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Remove coolant expansion tank - arrow -.
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Disconnect electrical wire to Engine Coolant Level (ECL) Warning Switch (F66) at bottom on expansion tank and set aside coolant expansion
tank with coolant hose - 1 - connected.
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Remove electrical harness connectors - 1 to 4 - from bracket at left of bulkhead.
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Disconnect connectors - 1 - and - 4 -.
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Remove bracket from bulkhead.
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Remove heat insulation sleeve on wiring harness and lay open wiring harness.
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Free up oxygen sensor wires downward.
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Remove left front wheel.
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Remove quick-release fasteners - 1 -, remove screws - 2 - and remove noise insulation.