A8 Quattro Sedan V8-4.2L (BVJ) (2008)
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Disconnect the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector - 1 -.
Checking internal resistance
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) terminals 3 to 4 for resistance.
Specified value: 2.5 to 10.0 ohms (at approx. 20 °C)
If the specification was not obtained: