A4 V6-3.0L (AVK) (2004)
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Remove cover -1- in engine compartment (left side).
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Remove coolant reservoir (arrow)
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Disconnect electrical wiring to Engine Coolant Level (ECL) Warning Switch -F66- at bottom of reservoir.
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Lay aside coolant reservoir with connected coolant hoses -1- to -3-.
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Remove bolts (arrows) on cylinder head at left.
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Disconnect 4-pin harness connectors -4- to -6- at ignition coils.
NOTE: For further testing, connect the multimeter to harness connector in place of an ignition coil.
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Connect multimeter for voltage measurement as follows.