Catalytic converter

1. Slacken the fastening nuts and remove the reinforcement bracket.
2. Slacken the nuts and screws and remove the front section of the exhaust pipe.

• Remove the seals.

CATALYTIC CONVERTER

The oxidising catalyst is a post-treatment device for oxidising the CO, HC's and particulate, turning them into carbon dioxide (CO₂) and water vapour (H₂O).

The catalytic converter consists of a one-piece ceramic honeycomb (1), the cells of which are impregnated with platinum (2), a substance which catalyses the reactions of oxidisation.

The exhaust gases that cross the cells heat the catalyst, triggering conversion of the pollutants into inert compounds. The chemical oxidation reaction of CO, HC and particulate is effective with temperatures between 200 and 350°C.

In fact beyond 350°C the sulphur contained in the fuel oil begins to oxidise, giving rise sulphur and sulphuric dioxide.

REMOVAL/REFITTING

• Set the car on a lift.

• Remove the front section of the exhaust pipe (see specific paragraph).

1. Loosen the fastening clamp and remove the catalytic converter.

EXHAUST, REAR SECTION

REMOVAL/REFITTING

• Set the car on a lift.

1. Loosen the clamp fastening the rear section of the exhaust pipe to the catalytic converter.
2. Release the handbrake cable from the fastenings.
3. Remove the exhaust pipe rear section after freeing it from its flexible supports.