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Home >> Audi >> 2024 >> S3 Premium >> Repair and Diagnosis >> Engine Mechanical >> Exhaust >> Exhaust System, Emission Controls (4-Cylinder Direct Injection 2.0L 4V TFSI Engine) (DSFA) >> 26 Exhaust System, Emission Controls >> Emissions Control System >> Catalytic Converter, Removing And Installing >> Removing

Catalytic Converter, Removing And Installing: Removing

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

-- Remove the connector -2- for the Oxygen Sensor 1 Before Catalytic Converter -GX10- from the bracket, disconnect it and free up the wire.

GWWA24-12190Courtesy of AUDI OF AMERICA, LLC
Fig 1: Catalytic Converter - Tightening Specification and Sequence
GWWA26-12315Courtesy of AUDI OF AMERICA, LLC
CAUTION:

Risk of injury due to flying soot particles.

Irritation and injury to skin and eyes possible.

- Wear protective eyewear.

- Wear safety gloves.

-- 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.)

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

Vehicles with a Particulate Filter:

GWWA26-12314Courtesy of AUDI OF AMERICA, LLC

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

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

GWWA26-12316Courtesy of AUDI OF AMERICA, LLC

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

GWWA10-12316Courtesy of AUDI OF AMERICA, LLC

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

GWWA26-11967Courtesy of AUDI OF AMERICA, LLC

Continuation for All Vehicles:

-- 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 2: Driveshaft Heat Shield
GWWN39-10761Courtesy of AUDI OF AMERICA, LLC

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

Fig 3: Mark Position Of Driveshaft
GWWN39-10718Courtesy of AUDI OF AMERICA, LLC

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

GWWA39-10725Courtesy of AUDI OF AMERICA, LLC

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

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

Fig 4: Identifying Driveshaft Flange Shaft Seal
GWWV39-1817Courtesy of AUDI OF AMERICA, LLC
CAUTION:

Leaks due to a damaged seal.

- Press the drive axle rearward horizontally.

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

GWWA26-11377Courtesy of AUDI OF AMERICA, LLC

-- Remove the catalytic converter with particulate filter.