A4 Sedan V6-3.2L (BKH) (2007)
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To disconnect the Heated Oxygen Sensor (HO2S) 2 (G108), perform the following steps:
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Remove the screw - arrow - retaining the coolant reservoir.
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Disconnect the Engine Coolant Level (ECL) Warning Switch (F66) electrical connector from 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 Oxygen Sensor (O2S) Heater (-Z28- ) electrical harness connector - 2 -.
Checking primary voltage
