S6 Quattro Sedan V10-5.2L (BXA) (2007)
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Disconnect the gray Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) electrical harness connector- 1 -.
Checking internal resistance
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Using a multimeter, check the Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) 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 Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288).