Where is the three-way catalytic converter on the car?

The car three yuan catalysts will remove harmful gases into harmless gas cars, three yuan catalysts is installed in the automobile exhaust system is one of the most important gas purification plant, automobile exhaust can be harmful gas such as CO, HC and NOx by oxidation and reduction into harmless carbon dioxide, water and nitrogen. If three yuan catalysts is damaged, the second-level above the oxygen sensor will not be able to provide correct data to the computer of driving, this mixture concentration will appear too thin or too thick, too thin will cause ignition difficulty and weakness, such as engine firing, too thick will increase fuel consumption, incomplete combustion, cylinder, spark plug carbon deposition, appear this kind of failure engine trouble light should be lit.