Catalytic Converters, Removing And Installing: Removing:

Proceed As Follows: 

-- On a vehicle with air suspension, activate vehicle lift mode. Refer to Self-Leveling Suspension .

-- Remove air guide pipe -arrows-.

Fig 1: Identifying Connecting Pipe -Arrows- And Electrical Connector -1-

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-- Remove the air filter upper part.

-- Disconnect the connector -1- at the Throttle Valve Control Module -J338-.

Fig 2: Locating Throttle Valve Control Module -J338- -1-

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-- Remove the bolts -arrows- and the Throttle Valve Control Module - J338-.

-- Remove vacuum lines on intake manifold as follows:

Fig 3: Identifying Vacuum Lines From Intake Manifold

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1  - For Evaporative Emission (EVAP) canister, press release buttons

3  - For the brake booster

-- Remove the bolt -arrow- from the intake manifold.

Fig 4: Identifying Intake Manifold Support Bolts -Arrow-

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-- Remove bolts -1 and 2- and remove heat shield.

-- Remove the heated oxygen sensors. Refer to OXYGEN SENSORS .

-- Remove the nuts on the connection between the catalytic converters and the exhaust manifold -arrows-.

Fig 5: Identifying Exhaust Pipe With Catalytic Converter To Exhaust Manifold Nuts -Arrows-

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-- Unscrew the retaining bolts for catalytic converter exhaust bank 1 -arrows-.

Fig 6: Identifying Bolts -Arrows- For Catalytic Converter Exhaust Bank 1

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-- Remove the noise insulation. Refer to NOISE INSULATION .

Fig 7: Identifying Front/Rear Noise Insulation

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-- Remove the noise insulation bracket -arrows-.

Fig 8: Identifying Bracket For Noise Insulation

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-- Remove the bracket -A-.

Fig 9: Identifying Position Of Double Clamp

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-- Loosen the clamps -arrows-. Unscrew mount -1 and 2-.

Fig 10: Identifying Clamps -Arrows- And Bolts -1 To 2-

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-- Support the transmission with the :VAG1383A  with :T10337  installed as shown.

Fig 11: Identifying Engine/Transmission Jack V.A.G 1383A And Installed Gearbox Support T10337

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-- Remove transmission carrier bolts -1 and 2-.

Fig 12: Identifying Transfer Case Support Bolts -1 And 2-

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-- Remove bolts -arrows- and remove transmission carrier.

Fig 13: Identifying Bolts -Arrows- And Transfer Case Bracket

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-- Remove the front prop shaft. Refer to appropriate service information. .

-- Unscrew the retaining bolt for catalytic converter exhaust bank 2 -arrow-.

Fig 14: Identifying Bolt -Arrow- For Catalytic Converter Exhaust Bank

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-- First remove the >>upper<< catalytic converter for exhaust bank 2 in a downward direction. Then remove the catalytic converter for exhaust bank 1.