Catalytic Converter: Description and Operation

DESCRIPTION AND OPERATION
The Three Way Catalytic Converter (TWC) is used to convert hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas to carbon dioxide (CO2), nitrogen (N2) and water vapor.

This system evaluates the catalyst's capacity by means of the Primary and Secondary HO2S output during stable driving conditions. If deterioration has been detected during three consecutive driving cycles, the MIL comes on and DTC PO42O or PO43O will be stored.