A8 Quattro Sedan V8-4.2L (BFM) (2005)
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Free up the wire for the Heated Oxygen Sensor (HO2S) (G39).
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Remove the catalytic converter with front muffler to exhaust manifold nuts - 1 through 3 -.
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Disconnect the electrical connector - 2 - (black) for the Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) (G130).
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Remove the bolt - 1 - for the exhaust pipe suspended mount.
