A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
Catalytic Converter: Service and Repair
Exhaust System Components, A4 Sedan and A5 Coupe
Catalytic Converter
Special tools, testers and auxiliary items required
‹› Hose Clamps up to 25 mm Diameter (3094)
Removing
‹› During installation, all cable ties must be re-installed at the same location.
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Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) and Oxygen Sensor (O2S) 1 (behind Three Way
Catalytic Converter (TWC)) Heater (Z29) connectors and free up the wires.
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Disconnect the Heated Oxygen Sensor (HO2S) (G39 ) and Oxygen Sensor (O2S) Heater (Z19) connectors and free up the wires.
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Disconnect connector - 1 - from the Mass Air Flow (MAF) Sensor (G70).
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Loosen air intake hose - 2 -.
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Remove air filter housing upward - arrows -.
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Remove noise insulation.