A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
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Catalytic Converter: Service and Repair
Catalytic Converter, Removing And Installing
Removing
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Remove engine cover - arrows - .
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Remove coolant expansion tank - arrow - and set it aside with coolant hoses attached.
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Disconnect electrical connector - 1 - for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 and Oxygen Sensor (O2S)
Heater 1 (behind Three Way Catalytic Converter (TWC)) Z29 (brown connector) and free up electrical wiring to catalytic converter.
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Disconnect electrical connector - 2 - for Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor (O2S) Heater Z19 (black connector) and free up
electrical wiring to catalytic converter.