Catalytic Converter, Removing And Installing, AUDI A3 From My 2021/TT From My 2015 With Fwd: Removing

• Follow the guidelines for clean working conditions. Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .
• During installation, all cable ties must be installed at the same location.

-- Remove the Oxygen Sensor 1 after Catalytic Converter -GX7-. Refer to HEATED OXYGEN SENSOR, REMOVING AND INSTALLING .

-- Remove from the bracket and then disconnect the connector -2- for the Oxygen Sensor 1 Before Catalytic Converter -GX10-, free up the wire (example illustration).

Fig 1: Exploded View Of Heated Oxygen Sensor

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Vehicles with a particulate filter:

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-- Remove the bolt -1- and free up the control lines (example illustration).

-- Loosen the hose clamps -2- and remove the hoses.

-- Loosen the left center underbody trim panel toward the exhaust system and push slightly downward. Refer to OVERVIEW - UNDERBODY TRIM PANELS .

Version 1:

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-- Loosen the tunnel heat shield. Refer to COMPONENT LOCATION OVERVIEW - HEAT SHIELD .

-- Remove the connector -arrow- from the bracket and disconnect them and then free up the wires.

Version 2:

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-- Free up the bracket -1- at the threaded pins.

-- Free up the Particulate Filter Differential Temperature Sensor -GX41- -item 3- at the bracket.

-- Disconnect the connector -4- and free up the wires -2 and 5-.

Continuation for All Vehicles:

Fig 2: Catalytic Converter - Tightening Specification and Sequence

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-- Remove the bolt -1- and the screw-type clamp.

-- Loosen the bolt -2- and disengage the catalytic converter upward and push to the side. (Shown with the engine removed.)

-- Remove the right drive axle heat shield. Refer to DRIVE AXLE HEAT SHIELD, REMOVING AND INSTALLING .

-- Audi A3: remove the tunnel brace. Refer to OVERVIEW - UNDERBODY BRACING .

-- Loosen the front clamping sleeve -arrow- and push it rearward.

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-- Remove the catalytic converter.

-- Seal the open lines and connections with clean plugs from the Engine Bung Set:VAS 6122  .