S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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Procedure for accessing the Heated Oxygen Sensor (HO2S) (G39) electrical harness.
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Remove the cover on the right side of the engine compartment - 1 -.
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Remove the air intake duct - arrows -.
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Disconnect the Heated Oxygen Sensor (HO2S) (G39 ) electrical harness connector - 1 -.
Checking primary voltage
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) electrical harness connector terminals 1 to 5 for voltage.
