Lower Rear Coolant Pipe, Removing And Installing: Removing

WARNING: This page is about a different car, the 2015 Audi S7, 2015 Audi RS 7, 2014 Audi S7, 2014 Audi RS 7, and 2013 Audi S7. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When installing, re-install heat insulation sleeves at the same locations.

-- Drain the coolant, refer to Draining .

-- Remove the left and right front muffler, refer to FRONT MUFFLER, REMOVING AND INSTALLING .

-- Remove the plenum chamber bulkhead, refer to Bulkhead .

-- Remove the connectors from the bracket, disconnect them and then free up the wires.

Fig 1: Identifying Connectors

Courtesy of AUDI OF AMERICA, LLC

1 -

for Oxygen Sensor after Three Way Catalytic Converter -G130- item -3-

4 -

for Heated Oxygen Sensor -G39- item -2-

-- Free up the wiring harness for the Heated Oxygen Sensor 2 -G108- and Oxygen Sensor 2 after Catalytic Converter -G131-.

NOTE:

The catalytic converter for the cylinder bank 1 (right) is on the left in the vehicle.

Fig 2: Identifying Nuts

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.

NOTE:

The catalytic converter for the cylinder bank 2 (left) is on the right in the vehicle.

Fig 3: Identifying Nuts

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -2 and 5-.

-- Fold the heat shield boots -1, 6- to the side.

-- Slide the heat shield boots -3- upward.

-- Loosen the hose clamps -arrows- to remove the coolant hoses from the lower rear coolant pipe -4- and then remove the coolant pipe.

Fig 4: Identifying Bolts And Lower Rear Coolant Pipe

Courtesy of AUDI OF AMERICA, LLC