Replacing New Cat Converter after 3K due to check engine light code PC0420

Could be you have a faulty leaking fuel injector or a faulty Air Mass sensor or any number of possible senarios. A good technicinian can diagnose to determine is there is another problem that is causing cats to fail. Also if you are having aftermarket less costly cat converters installed that in itself could be a major part of your problem. Cheap replacemement Cats do not satisfy the emmision standards due to having much less of the platiumin that the oriqinal equipment Cats have.

COULD BE ANYTHING WITH THE FUEL SYSTEM. DO YOUR HAVE A CK ENG LIGHT ON?