![]() ![]() ![]() ![]() ![]() If you need to replace the catalytic converter in California you have to use a CARB approved Catalytic convertor. If the fuel trims are in excess of 8% I would look into that issue first.Īlso, have the spark plugs been replaced yet? If not I would replace those and the secondary O2 sensor as well. If those look good, I would replace the O2 sensor after the catalytic converter and see if the error clears. If I were troubleshooting this, I would look at the fuel trim long and short for banks 1 and 2 and make sure you are close to 0. So if you had an oil burning issue and if those bank 1 cylinders were burning oil, you might have a case, to go to the dealer and get some help on this issue. So this P0420 code says that the bank 1 catalytic converter is under efficiency threshold. Here is the bottom line, Catalytic convertors do not wear out, they are destroyed by oil, coolant, lead, phosphorus, silicone, and bad fuel mixtures.
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