A6 Quattro Sedan V6-3.2L (BKH) (2005)
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Remove coolant expansion tank - arrow -.
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Disconnect electrical connection from Engine Coolant Level (ECL) warning switch (F66) at bottom of coolant reservoir and set aside coolant
reservoir with coolant hoses - 1 - and - 2 - connected.
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Disconnect electrical harness connector - 2 - for Oxygen Sensor (O2S) 2 behind Three Way Catalytic Converter (TWC) (G131) and free up wire.
‹› Ignore - 1 -.
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Remove oxygen sensor - 2 - using ring spanner set (3337).
