K Yukon/Denali 4WD V8-5.7L VIN R (2000)
Catalytic Converter: Description and Operation
Catalyst Monitor Diagnostic Tests
The emissions control system used on this vehicle has a 3-way catalytic (TWC) converter in order to reduce exhaust emissions of Hydrocarbons (HC),
Carbon Monoxide (CO), and Oxides Of Nitrogen (NOx). The catalyst material inside of the converter promotes a chemical reaction in order to combine
oxygen with the HC and CO, converting them to water vapor (H2O) and harmless carbon dioxide (CO2). The NOx is converted to Nitrogen (N) by the
converter.
The control module has the ability to monitor the efficiency of the catalytic converter through the use of a Heated Oxygen Sensor (HO2S) mounted in
the engine exhaust gas stream after the catalytic converter or post-catalyst.
