Lower Rear Coolant Pipe, Removing And Installing: Removing

WARNING: This page is about a different car, the 2018 Audi S6, 2017 Audi S6, and 2016 Audi S6. 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 COOLANT, DRAINING AND FILLING .

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

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

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

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1 - For Oxygen Sensor after Three Way Catalytic Converter -G130- -3-

4 - For Heated Oxygen Sensor -G39- -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.

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-- 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.

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-- Remove the bolts -2 and 5-.

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-- Fold the heat shield boots -1 and 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.