A8L V8-4.2L (BFM) (2004)
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Free up the wire for the Heated Oxygen Sensor (HO2S) 2 (G108).
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Remove the catalytic converter with front muffler to exhaust manifold nuts - arrows -.
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Disconnect the electrical connector - 3 - (brown) for the Oxygen Sensor (O2S) 2 behind Three Way Catalytic Converter (TWC) (G131) and free
up the wire.
