Catalytic Converter, Removing And Installing, AUDI A3 From My 2021/Q2 From My 2016/AUDI Q3 From My 2019 With AWD: 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 left center underbody trim panel toward the exhaust system and push slightly downward. Refer to OVERVIEW - UNDERBODY TRIM PANELS .

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

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-- Remove the nuts -arrows-, free up the bracket -1- for the control line and push it to the side.

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-- Remove the union nuts -arrow- and free up the control lines.

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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 .

-- Remove the bolts -A and B Arrows- and the heat shield -1-.

Fig 3: Driveshaft Heat Shield

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-- Mark the position of flexible disc and the bevel box flange to each other for reinstallation -arrows-.

Fig 4: Mark Position Of Driveshaft

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-- Using a lever to counterhold the triangular flange, remove the driveshaft from the bevel box -arrows-.

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-- Lower the subframe. Refer to SUBFRAME, LOWERING .

-- Press the engine/transmission assembly slightly forward (toward the front end) and remove the driveshaft from the bevel box.

Fig 5: Identifying Driveshaft Flange Shaft Seal

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• If the gasket is damaged, the driveshaft must be replaced.

-- 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  .