A6 Quattro Sedan V6-3.2L (BKH) (2005)
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Disconnect the 4-pin electrical harness connector - 2 - from Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) and
Oxygen Sensor (O2S) Heater (-Z29-) (bank 1, sensor 2).
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Remove the screw - arrow - retaining the coolant reservoir.
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Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch (F66) at the bottom of the coolant reservoir and set aside
the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.
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Disconnect the electrical 4-pin harness connector - 2 - from Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) and
Oxygen Sensor (O2S) Heater 2 (behind Three Way Catalytic Converter (TWC)) (Z30) (bank 2, sensor 2).