A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) terminals 1 to 2 for resistance.
Specified value: 2.5 to 14.0 ohms (at approx. 20 °C)
If the specification was not obtained:
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Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130). Refer to the appropriate service manual.
If the specification was obtained:
Checking voltage supply
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Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminal
1 to ground (GND) for voltage.