Catalytic Converter, Removing And Installing: Removing

-- Remove the plenum chamber bulkhead. Refer to PLENUM CHAMBER BULKHEAD, REMOVING AND INSTALLING .

-- Remove the left and right front mufflers. Refer to FRONT MUFFLER, REMOVING AND INSTALLING .

-- Remove the Heated Oxygen Sensor 2 -G108-. Refer to HEATED OXYGEN SENSOR 2 -G108 - / OXYGEN SENSOR AFTER THREE WAY CATALYTIC CONVERTER -G130-, REMOVING AND INSTALLING .

-- Remove the connector -1- for the Oxygen Sensor after Three Way Catalytic Converter -G130- -3- from the bracket and disconnect it. Free up the wire.

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolt -2- from the suspended mount for the catalytic converter on the left side in the vehicle.

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolt -arrow- from the suspended mount on the right side in the vehicle.

Courtesy of AUDI OF AMERICA, LLC

Catalytic Converter For Cylinder Bank 2: 

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -arrows- and the right heat shield -1-.

-- Remove the bolts -arrows- and remove the right drive axle heat shield.

Courtesy of AUDI OF AMERICA, LLC

-- Release the locking mechanism in direction of -arrows-, and free up the wires to disconnect and remove the connectors from one another and out of the mount:

Courtesy of AUDI OF AMERICA, LLC

2  - For Oxygen Sensor 2 after Catalytic Converter -G131-

1  - For Heated Oxygen Sensor -G39-

Continued For Both Sides 

Courtesy of AUDI OF AMERICA, LLC

-- Remove the nuts -arrows- from the cylinder bank 1 (right) and then remove the catalytic converter in the left of the vehicle, toward the rear.

-- Remove the nuts -arrows- from the cylinder bank 2 (left) and then remove the catalytic converter on the right in the vehicle, toward the rear.

Courtesy of AUDI OF AMERICA, LLC

-- First remove the catalytic converter on the left side of the vehicle and then remove the catalytic converter on the right side.