catalytic converter
US /ˌkæt̬.əˌlɪt̬.ɪk kənˈvɝː.t̬ɚ/
UK /ˌkæt̬.əˌlɪt̬.ɪk kənˈvɝː.t̬ɚ/

1.
conversor catalítico, catalisador
an apparatus fitted to the exhaust system of a motor vehicle, containing a catalyst for converting pollutant gases into less harmful ones
:
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The mechanic replaced the faulty catalytic converter.
O mecânico substituiu o conversor catalítico defeituoso.
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New cars are required to have a catalytic converter to reduce emissions.
Carros novos são obrigados a ter um conversor catalítico para reduzir as emissões.