You may need a shop to look at this.
Code 420 is saying the catalytic converter is not working well on bank one and code 430 is the same thing for bank two.
There is an O2 sensor in front and behind each cat. The computer uses the readings from the front and back sensors to judge the performance of the catalytic converters.
Since it would be very rare for both cats to fail at the same time, chances are the problem is a vac leak or injector problems with the engine. I would say something wrong is happening before the exhaust gets to the catalytic converters.
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