With Manufacturer's Scan Tool

Catalytic Converter, Removing And Installing

Removing

Removing front exhaust pipe







- Disconnect 4-pin connectors of oxygen sensors and move wires clear.
1. (Brown) to O2S Behind TWC -G130- (only with engine code AMB)
2. (Black) to HO2S -G39-







- Remove air cleaner cover (arrow).







- Remove bolts (arrows).
- Disengage EVAP canister purge regulator valve -N80 -1- from air duct -2-.
- Remove both screws (arrows) for air duct -2-.







- Disconnect wiring connectors from:
1. EVAP valve
2. Mass Air Flow sensor
3. Wastegate bypass regulator valve -N75-

- Disconnect hoses -4 to 7-.







- Disconnect hose to secondary air injection pump motor -8-.
- Move wiring clear.
- Unbolt air cleaner housing -9-.
- Remove air cleaner.

NOTE: Vacuum line to secondary air combination valve is clipped to underside of air intake hose.







- Remove bolts (arrows) securing turbocharger to catalytic converter.
- Lift out catalytic converter.

Installing
Install in reverse order, paying attention to the following:
- Grease threads of oxygen sensor only with hot bolt paste G 052 112 A3; paste must not be allowed to come into contact with slits in sensor body.
- Align exhaust system free of stress.

Tightening torques

Components Nm
Oxygen sensor to catalytic converter 55
Catalytic converter to turbocharger 40
Front exhaust pipe to catalytic converter 25
Front exhaust pipe to transmission bracket 25
Clamp for front exhaust pipe 40
Heat shield to transmission 23
Hose clamps for air hoses 3.5