S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Remove the air guide hoses - 1 - and - 6 - from the air filter housing.
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Loosen the hose clamps - 2 - and - 4 - and remove the air filter housing.
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Disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector - 1 -.
Checking internal resistance
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Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) terminals 1 to 2 for resistance.