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Catalytic Converter: Description and Operation

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.