Catalytic Converter

The oxidizing catalytic converter is installed in the front section of the exhaust system. The catalytic converter assembly is common to all Petrol vehicles, however, the catalyst coating specification varies depending on the market.

The HO2S's (Heated Oxygen Sensor) monitor the exhaust gasses leaving the engine. Two HO2S (Heated Oxygen Sensor) are fitted to each pipe; a mid catalytic converter and a post catalytic converter HO2S (Heated Oxygen Sensor). The engine management system uses this information to provide accurately metered quantities of fuel to the combustion chambers to ensure the most efficient use of fuel and to minimize the exhaust emissions.

For additional information, refer to: Electronic Engine Controls .

The catalytic converter further reduces the carbon monoxide and hydrocarbons content of the exhaust gases. In the catalytic converter the exhaust gases are passed through honeycombed ceramic elements coated with a special surface treatment called a 'washcoat'.

The washcoat increases the surface area of the ceramic elements by a factor of approximately 7000. On top of the washcoat is a coating containing platinum group metals (PGMs), which are the active constituents for converting harmful emissions into inert by-products. The PGMs react with oxygen, and these, when combined with the carbon monoxide and hydrocarbons in the exhaust gases, convert them into carbon dioxide and water respectively.