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Celica 4WD L4-122 1998cc 2.0L DOHC Turbo (3S-GTE)
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Catalytic Converter
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Description and Operation
Catalytic Converter: Description and Operation
THREE-WAY CATALYST (TWC) SYSTEM
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.