A6 Quattro Wagon V6-3.2L (BKH) (2006)
(bank 1, sensor 2).
To test the Oxygen Sensor (O2S) Heater (-Z30-) (bank 2, sensor 2), 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 4-pin electrical harness connector - 2 - from the Heated Oxygen Sensor (HO2S) (-G131-) and Oxygen Sensor (O2S) Heater (-Z30-)
(bank 2, sensor 2).
Checking internal resistance
‹› Terminals - 2 - and - 3 - Are not called out in the graphic.