S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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Disconnect the Oxygen Sensor (O2S) Heater (Z29 ) for Heated Oxygen Sensor (HO2S) (G39) electrical harness connector - 4 -.
Checking internal resistance
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) terminals 1 to 2 for resistance.
Specified value: 1.0 to 20.0 ohms (at approx. 20° C)
If the specification was not obtained:
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Replace the faulty Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) Refer to Fuel Injection and Ignition Repair Information.
