S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Loosen the hose clamps - 2 - and - 4 - and remove the air filter housing.
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Disconnect the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector - 2 -.
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)