A6 Quattro Sedan V6-3.2L (BKH) (2005)
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Disconnect the 6-pin electrical harness connector - 1 - from the Heated Oxygen Sensor (HO2S) (-G39-) and Oxygen Sensor (O2S) Heater (-Z19-)
(bank 1, sensor 1).
To test the Heated Oxygen Sensor (HO2S) (-G108-) (bank 2, sensor 1), perform the following steps:
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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 6-pin electrical harness connector - 1 - from the Heated Oxygen Sensor (HO2S) (-G108-) and Oxygen Sensor (O2S) Heater (-Z28-)