A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector - 4 -.
Checking primary voltage
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Switch the ignition on.
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Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector
terminals 3 to 4 for voltage.
Specified value: 0.400 to 0.500 Volts
