A6 Quattro Sedan V6-3.0L (AVK) (2002)
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Clamp coolant hose -2- using 3094 hose clamps and disconnect coolant hose from coolant reservoir.
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Unbolt coolant reservoir (arrow).
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Disconnect electrical wiring to Engine Coolant Level (ECL) Warning Switch -F66- at bottom of expansion tank.
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Lay coolant expansion tank with connected coolant hoses -1- and -2- to side.
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Disconnect electrical harness connectors -1- and -2- at Camshaft Position (CMP) Sensor 2 -G163- and Camshaft Position (CMP) Sensor 4 -G301-.
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Disconnect hose -3- from crankcase ventilation at cylinder head cover.
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Remove heat shield for harness connectors at left of bulkhead.
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Remove bolts -1- at flange of combination valve for secondary air injection.
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Loosen nut -3- several turns.