Catalytic Converter: Service and Repair

Front Exhaust Pipe with Catalytic Converters and Front Muffler

Removing

- Remove resonance tube - 2 - from air guide hose.





- Remove air guide hose - 1 - from throttle valve control module (J338).

- Disconnect the electrical connector - 3 - for the mass air flow sensor (G70).

- Detach upper section of air filter housing - arrow - and remove air filter insert.

- Remove bolts - arrows - and remove air duct.





- Remove lower section of air filter housing - arrows -.





- Remove electrical connectors from bracket and disconnect.

- Free up electrical wires.





1. For Heated Oxygen Sensor (HO2S) 2 (G108)

2. For Heated Oxygen Sensor (HO2S) (G39)

• Ignore - 3 -.

- Remove nuts accessible from above from front exhaust pipe to exhaust manifold connection.





- Remove noise insulation in center by loosening mounting parts - 1 through 4 -.





- Remove nuts - 1 - and - 2 - under vehicle floor.





- Remove cover from oxygen sensor electrical connector bracket.

- Remove bolt - 3 - and free up electrical wiring to oxygen sensors.

- Remove electrical connectors from bracket and disconnect:





1. For Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWO) (G130)

2. For Oxygen Sensor 2 After Catalytic Converter (G131)

- Remove nuts accessible from below from front exhaust pipe to exhaust manifold connection.





- Remove exhaust system bracket and tunnel brace - arrows -.





Risk of damaging decoupling elements.

• Do not bend decoupling element in front exhaust pipe more than 10°.

- Disconnect exhaust system at clamping sleeve - 1 -.





- Remove front exhaust pipes with catalytic converters and front muffler.

Installing

• Tightening specifications, refer to => [ Muffler Assembly Overview ] Muffler Assembly Overview.

Installation is in reverse order of removal, note the following.

• Replace seals and self-locking nuts.

- Install exhaust system free of stress. Refer to => [ Exhaust System, Installing ] Removal and Replacement.