A4 Quattro Sedan L4-1.8L Turbo (AWM) (2001)
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Disconnect wiring connectors as follows:
1 - on ACF valve (in addition, remove ACF valve from air filter housing)
2 - on mass air flow sensor
3 - on Wastegate Bypass Regulator valve -N75-
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Disconnect hose connections, move wiring aside and remove air filter housing -arrows-.
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Loosen bolted connection of front exhaust pipe/catalytic converter accessible from above.
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Undo bolts -arrows- of exhaust turbocharger/catalytic converter.
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Remove catalytic converter upward.
Installing
Installation is carried out in the reverse order of removal.
Note: Always replace seals, gaskets and self-locking nuts.
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Grease threads of oxygen sensors with high temperature lubricant G 052 112 A3. Apply lubricant only to threads of sensors; the lubricant must not
get into the slots on the sensor body.
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Align exhaust system stress-free.
