Catalytic Converter: Service and Repair

Three Way Catalytic Converter (TWC), removing and installing
Removing

Note:
^ Replace gaskets and self-locking nuts.
^ Flexpipe in front exhaust pipe must not be bent more than 10°, otherwise it may be damaged.

^ Disconnect harness connector for heated oxygen sensor (arrow) and set aside.

^ Remove coolant expansion tank -2 (arrows)
^ Remove wiring from Engine Coolant Level (ECL) warning switch -F66- and lay coolant expansion tank to side.

Note: Coolant hoses -1- and -3- remain connected.

^ Remove air guide duct between cowl and air cleaner housing.
^ Remove air cleaner housing cover.





^ Remove the following lines/harness connectors:
1 - At wastegate, bypass regulator valve -N75-
2 - At Evaporative Emissions (EVAP) purge regulator valve -N80-
3 - At power output stage -N 122-
4 - At Mass Air Flow (MAF) sensor -G70-

^ Pull off hose connections and remove air cleaner housing (arrows).
^ Remove Heated Oxygen Sensor (H02S) from Three Way Catalytic Converter (TWC).
^ Remove bolts between front exhaust pipe and Three Way Catalytic Converter (TWC).
^ Unbolt transmission mount for exhaust system at exhaust system.
^ Remove bolts between three Three Way Catalytic Converter (TWC) and turbocharger.
^ Remove Three Way Catalytic Converter (TWC) toward top.

Installing
Installation is the reverse of removal, noting the following:
^ Only grease threads of oxygen sensor with "G 052 112 A3." Do NOT allow grease to get into slots on sensor body.
^ Align exhaust system free of stress.








Tightening torques