18 32 050 Removing and installing/replace catalytic converter for cylinders 1-3 (N54, N54T)

WARNING: This page is about a different variant/trim than selected.

WARNING: Risk of burning!
This repair work may only be carried out on an exhaust system which has cooled down.

Necessary preliminary tasks:

Remove front UNDERBODY PROTECTION .
Remove rear UNDERBODY PROTECTION .
Remove EXHAUST SYSTEM .
Release right TRACK ROD from steering box

NOTE: The oxygen sensors are in danger of being damaged when the catalytic converters are removed and installed.
Remove CONTROL SENSOR , cylinders 1 to 3.
Remove MONITORING SENSOR from cylinders 1 to 3.

Release screws (1).

Remove guard plate (2).

Fig 1: Identifying Guard Plate And Screws

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Unscrew nuts (1).

Tightening torque 18 20 2AZ .

Fig 2: Locating Nuts

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Release screws and remove holder (1).

Replace aluminium screws.

Tightening torque automatic transmission 24 00 2AZ.

Tightening torque manual gearbox 23 00 2AZ .

Fig 3: Locating Holder Screws

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Unfasten clamp. The clamp must be replaced every time it is removed.

Tightening torque 18 31 3AZ .

In so doing, secure catalytic converter (1) against falling out.

Feed out catalytic converter (1) and remove.

Installation note:

Clean sealing surface. Replace clamp and seal.

Align the catalytic converter with the connecting piece of the exhaust system and tighten.

Fig 4: Identifying Catalytic Converter

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Reassemble the vehicle.

Check exhaust system for leaks.