Toyota camry RAV4 ternary catalytic converters Ternary catalytic converters, which is installed in the automobile exhaust system is one of the most important gas purification device, it can be auto exhaust CO CO, HC hydrocarbons and the harmful gas such as nitrogen oxide NOx by oxidation and reduction into harmless carbon dioxide, water and nitrogen. Properties: the product is divided into four attributes: European standards: ordinary, quiet type;The three criteria: the year of careful, exhaust up to standard;The four criteria: the year of careful and eliminate trouble light, tail gas.