S4 V8-4.2L (BHF) (2004)
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Disconnect vacuum line - arrow - to brake booster at bulkhead.
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Disconnect coolant hose to heater core at rear coolant pipe on engine.
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Disconnect coolant hose from Y-connector - arrow -.
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Disconnect electrical harness connector - arrow - for Camshaft Position (CMP) Sensor 2 -G163- on left cylinder head.
Note: The following illustration shows the engine as removed, from behind.