A8L V8-4.2L (BFM) (2004)
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Disconnect all 8-pin connectors from fuel injectors.
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Set both connector strips to the side.
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Remove all socket head cap screws from intake manifold.
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Carefully pull intake manifold up and out. Water connection on throttle valve control module remains connected.
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Set intake manifold to the side, paying attention to the water connection.
‹› Plug the intake ports of the cylinder head with clean rags.
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Disconnect respective oxygen sensor connector.
2
4-pin connection for heated oxygen sensor (HO2S) 2 (G108) and oxygen sensor (O2S) heater 2 (Z28) before catalytic converter of bank 2
3
4-pin connection for heated oxygen sensor (HO2S) (G39) and oxygen sensor heater (Z19) before catalytic converter of bank 1
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Open all cable ties in order to expose electrical wires.
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Remove respective oxygen sensor with tool from Ring Spanner, 7 piece set (3337) (Illustration shows Heated Oxygen Sensor (HO2S) (G108),
bank 2).
Installing
‹› New oxygen sensors are coated with assembly paste; the paste must not get into slots of oxygen sensor body.
‹› For a used oxygen sensor, only coat threads with hot bolt paste. This paste must not come into contact with sensor slots.