From 1994 onwards, they were required to have a Diesel Oxidation Catalyst. From 2008 onwards (in the US), a set of emissions standards requiring highway diesel engines to have a Diesel Particulate Filter went into effect. From 2012 onwards, engines over a certain displacement required a complete aftertreatment system, with a DOC, DPF, and Selective Catalytic Reduction, which uses Diesel Exhaust Fluid (DEF).
It is a federal law that catalytic converters are required on all cars built after 1975
The first year for Catalytic converters was 1975They were first required on all cars in 1975.
Yes. All cars made after 1975 are required to have one.
American cars have had catalytic converters since the mid 1970's.
Platinum
the mid 1970s
Catalytic converters for cars.
Mercedes,bmw,acura
No, diesels can and do have them also.
Catalytic converters.
very little since the invention of catalytic converters.
Old cars give off more carbon dioxide because they do not have catalytic converters. Catalytic converters act as catalysts, converting dangerous substances such carbon monoxide into harmless compounds.