Catalytic Converter: Description and Operation

CATALYTIC CONVERTER - GENERAL INFORMATION
The three-way catalytic converter, together with the closed loop air-fuel ratio control (based on the oxygen sensor signal) oxidizes Carbon Monoxides (CO) and Hydrocarbons (HC), and reduces Nitrogen Oxides (NOx). When the mixture is controlled at stoichiometric air-fuel ratio, the three-way catalytic converter provides the highest purification against CO, HC, and NOx.