Pre-Catalytic Converter, Removing And Installing: Removing

WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, and 2013 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

When working on the whole exhaust system:

Follow the safety precautions when working on the exhaust system. Refer to EXHAUST SYSTEM SAFETY PRECAUTIONS .

-- Remove the noise insulation -1 and 2-. Refer to NOISE INSULATION, REMOVING AND INSTALLING .

Fig 1: Identifying Front/Rear Noise Insulation

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Courtesy of AUDI OF AMERICA, LLC

-- Remove the Heated Oxygen Sensor -G39-. Refer to Removing .

-- Remove the NOx Sensor -G295- -2- and set aside.

Fig 2: NOx Sensor -G295- Location

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Courtesy of AUDI OF AMERICA, LLC

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

Fig 3: NOx Sensor -G295- Nuts Location

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Courtesy of AUDI OF AMERICA, LLC

-- Remove the nuts -1, 2 and 3-.

Fig 4: Pre-Catalytic Converter Nuts Location

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Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore -arrow-.

-- Remove the bolt -arrow- from the tab on the pre-catalytic converter.

Fig 5: Identifying Bolt -Arrow- From Exhaust Pipe

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Courtesy of AUDI OF AMERICA, LLC

-- Remove the nuts -arrows-.

Fig 6: Preliminary Catalytic Converter Flange Nuts

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Courtesy of AUDI OF AMERICA, LLC

-- Remove the pre-catalytic converter from the engine compartment.