S8 Quattro Sedan V10-5.2L (BSM) (2009)
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Disconnect the black Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector- 1 -.
Checking internal resistance
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 (G108) terminals 3 to 4 for resistance.
Specified value: 2.5 to 10.0 ohms (at approx. 20 °C)
If the specification was not obtained:
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Replace Heated Oxygen Sensor (HO2S) 2 (G108).
If the specification was obtained:
Checking voltage supply
Crank the engine.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector terminal 4 to Ground (GND) for voltage.