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1.1 Undo hexagon-head bolt M6 x 34 (wrench size 13).
1.2 Undo hose clamp on throttle body and pull plug off the mass air flow meter. Unclip wire on air cleaner housing and remove air cleaner assembly.
Sequence when removing the catalytic converters:
Remove catalytic converter of cylinder bank 4 - 6
1. In the engine compartment, pull the oxygen sensor plug connection from its holder, unlock and disconnect.
Black connector - oxygen sensor in front of the catalytic converter
Grey connector - oxygen sensor behind the catalytic converter
2. Unclip cable on engine carrier.
This is a source reference. Confirm exact model applicability in the original material.