Catalytic Converter: Service and Repair

Catalytic Converter with Front Exhaust Pipe

Special tools, testers and auxiliary items required

• Torque wrench (5-50 Nm) (VAG 1331)

Removing

- Remove the engine cover/upper air filter housing. Refer to => [ Engine Cover/Upper Air Filter Housing ] Engine Cover/Upper Air Filter Housing.

- Disconnect the Heated Oxygen Sensor (HO2S) electrical connector - arrow - and free up the wire.





- Remove the nuts - arrows - of the front exhaust pipe/turbocharger.





- Remove right underbody trim retainer - arrows - and trim.





- Unclip the wire - arrow -, remove the connector from the bracket - 1 - and disconnect the connector - 2 - for the Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC).





• The flex joints in the front exhaust pipe must not be bent more than 10 degrees, otherwise they may be damaged.

- Loosen the exhaust system clamp - arrows -.





- Remove the exhaust system suspended mount bolts - arrows -.





- Remove the front crossmember nuts - arrows - and crossmember.





- Remove the catalytic converter with front exhaust pipe.

Installing

Installation is performed in reverse order. When doing this note the following:

• Lubricate the turbocharger stud bolts with hot bolt paste (G 052 112 A3).

• Replace gaskets and self locking nuts.

• Install the exhaust system free of stress. Refer to => [ Exhaust System, Installing ] Exhaust System, Installing.

Tightening Specifications