EMISSION CONTROL SYSTEMS — Three-Way Catalyst (TWC) System EC-15 THREE-WAY CATALYST (TWC) SYSTEM [DIAGRAM showing exhaust system with components labeled: NOx CO HC flowing through Three-way Catalyst (Monolithic) to CO2, N2, H2O] To reduce HC, CO and NOx emissions, they are oxidized, reduced and converted to nitrogen (N2), carbon dioxide (CO2) and water (H2O) by the catalyst. Exhaust port TWC Exhaust Gas HC,CO, AND NOx -------> OXIDATION AND -------> CO2 REDUCTION H2O N2 INSPECTION OF EXHAUST PIPE ASSEMBLY 1. CHECK CONNECTIONS FOR LOOSENESS OR DAMAGE 2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE INSPECTION OF CATALYTIC CONVERTER CHECK FOR DENTS OR DAMAGE If any part of protector is damaged or dented to the extent that it contacts the catalyst, repair or replace. [DIAGRAM showing catalytic converter with arrow pointing to inspection area]