S5 Quattro Coupe V8-4.2L (CAUA) (2009)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor in Front of Catalytic Converter and Oxygen Sensor Behind Three Way
Catalytic Converter, Cylinder Bank 1
Heated Oxygen Sensor in Front of Catalytic Converter and Oxygen Sensor Behind Three Way Catalytic Converter, Cylinder Bank 1
Special tools, testers and auxiliary items required
‹› Ring Spanner 7-Piece Set for Oxygen Sensor (3337)
Removing
‹› During installation, all cable ties must be re-installed at the same location.
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Remove the engine cover.
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Disconnect electrical connector - 1 - on Mass Air Flow (MAF) Sensor (G70).
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Disconnect the vacuum line - 3 - to the air guide pipe.
CAUTION!
Risk of violating emissions legislation.
‹› Do not open hose connection - 2 -!
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Loosen the clamps - 4 -, open the clips - arrows - and move the air guide hose to the side with the crankcase ventilation hose still connected - 2 -.
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Remove affected electrical connector from bracket and disconnect it.