Catalytic converter: Equipment in the exhaust system that transforms the contaminant gases radiated by the car.
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It is made up of a special ceramic filter that, if there are any contaminant gases, transforms them chemically into gases that are less harmful, such as carbon dioxide, nitrogen and water vapor. It usually reaches very high temperatures. Its usage is mandatory by law.
After failing nct on emissions on my Toyota Corolla 1.13 new lambda sensor fitted & reconditioned catalytic convertor. Emissions shot up to 6.1, was my catalytic convertor better than the replacement ???