A6 Quattro Sedan V8-4.2L (BVJ) (2007)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor 2, in Front of Catalytic Converter and Oxygen Sensor 2 behind Three Way
Catalytic Converter, Cylinder Bank
Heated Oxygen Sensor 2, in Front of Catalytic Converter and Oxygen Sensor 2 behind Three Way Catalytic Converter, Cylinder Bank 2
Special tools, testers and auxiliary items required
‹› Ring Spanner 7-Piece Set For Oxygen Sensor (3337)
Removing
‹› All cable ties opened or cut during engine removal must be reinstalled at the same locations during installation.
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Remove rear engine cover.
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Remove the coolant expansion tank - arrow - and disconnect the connector on the Engine Coolant Level Warning Switch (F66) on the bottom of
the expansion tank.
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Move the coolant reservoir to the side with hoses - 1 through 3 - connected.
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Remove affected electrical connector from bracket and disconnect it.
1
Heated Oxygen Sensor (HO2S) 2 (G108)
2
Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131)
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Remove Heated Oxygen Sensor (HO2S) 2 (G108) - 1 - using a tool from the Ring Spanner Set (3337).
