Civic EX Sedan L4-1668cc 1.7L SOHC (VTEC) MFI (2001)
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Catalytic Converter: Description and Operation
Catalytic Converter System
NOX Adsorptive Three Way Catalyst (NOX Adsorptive TWC) (D17A6 engine)
The NOx adsorptive TWC absorbs NOx created during lean burn running when the oxygen concentration is high. Then the engine is put into a richer
running mode where the oxygen concentration and NOx levels are low, and the absorbed NOx is released, keeping the average NOx emissions low.
Three Way Catalytic Converter (TWC)
The TWC converts hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas to carbon dioxide (CO2), dinitrogen
(N2), and water vapor.
