Catalytic Converter: Service and Repair

Three-way catalytic converter (TWC), replacing

Special tools:
999 2901 FUEL HOSE PLIERS 999 2901 Fuel Hose Pliers

Exhaust pipe front from three-way catalytic converter (TWC), removing

Exhaust pipe front, removing




Raise the car.
Apply rust solvent to all components.

Remove:
- the rear engine cover
- the nuts and the front exhaust pipe
- gasket
- the lower (rear) heated oxygen sensor (HO2S).
Lower the car.

Three-way catalytic converter (TWC), removing





Remove:
- the heat shield from the car body
- the upper (front) heated oxygen sensor (HO2S)
- the nuts. Lift out the three-way catalytic converter (TWC)
- the gasket.

Three-way catalytic converter (TWC), installing

Note! To ensure that there is no exhaust leakage, see: Flanged joint, assembling Flanged Joint, Assembling.

Three-way catalytic converter (TWC), installing




Clean the mating surfaces.

Install:
- the gasket on the turbocharger (TC)
- the three-way catalytic converter (TWC). The nuts. Tighten to 30 Nm.

Heated oxygen sensor (HO2S) front (upper), installing




- Install a new sealing ring
- Apply copper paste (P/N 1161035-9) to the entire length of the screw thread
- To avoid damage from twisting to the cable harness for the heated oxygen sensor (HO2S), turn the probe approximately 4 turns counter-clockwise before inserting it
- Install the heated oxygen sensor (HO2S). Tighten to 55 Nm
- Install the heat shield on the body.
Raise the car.

Rear (lower) heated oxygen sensor (HO2S), installing




- Install a new sealing ring
- Apply copper paste (P/N 1161035-9) to the entire length of the screw thread
- To avoid damage from twisting to the cable harness for the heated oxygen sensor (HO2S), turn the probe approximately 4 turns counter-clockwise before inserting it
- Install the heated oxygen sensor (HO2S). Tighten to 55 Nm.

Exhaust pipe front on three-way catalytic converter (TWC), installing




Clean the mating surfaces.
- Install a new gasket
- Secure the front exhaust pipe to the manifold. Tighten the nuts. Tighten to 25 Nm
- Reinstall the splash guard.

Check the function
Start the engine. Check that there is no leakage.