Catalytic Converter: Service and Repair

Catalytic Converter, removing and installing

Removing





^ Remove heat shield -arrows- above righthand drive shaft.
^ Loosen bolted connection front exhaust pipe/catalytic converter accessible from below.





^ Remove bolt for gearbox bracket to exhaust system -arrow-.

Note: The flexible connection in the front exhaust pipe must not be deflected more than 10° to avoid damage.





^ Unbolt coolant expansion tank -2-, - arrows-.
^ Disconnect wire to Engine Coolant Level (ECL) Warning switch -F66- and move coolant expansion tank to one side.

Note: Coolant hoses -1- and -3- do not have to be disconnected.





^ Disconnect wiring connector for oxygen sensors and move wiring aside.
1 - (brown) to oxygen sensor downstream of catalytic converter G130-
2 - (black) to oxygen sensor upstream of catalytic converter -G39-





^ Remove air filter cover -arrow-.





^ Remove bolts -arrows-.
^ Remove air duct -1- and -2-.





^ 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-
^ Disconnect hose connections, move wiring aside and remove air filter housing -arrows-.
^ Loosen bolted connection of front exhaust pipe/catalytic converter accessible from above.





^ Undo bolts -arrows- of exhaust turbocharger/catalytic converter.
^ Remove catalytic converter upward.

Installing
Installation is carried out in the reverse order of removal.

Note: Always replace seals, gaskets and self-locking nuts.

^ 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.
^ Align exhaust system stress-free.





Tightening torques