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It could be one of three thiings worst first. Cat. converter is bad $400 to $1000. Sensor or sensors are bad $40 to $150 each. Air leaking into exhaust when hot prior to converter. Big Doubt here! Engine exhaust pushes out not in! It's being read on Bank (2) sensors If it were reading on Bank (1) it would Be PO420.
If sensors are High Mileage Over a 100K they probably are bad but should be scanned before spending money on something that isn't going to help.
If you have a V type motor and your getting 420 and 430 it's more then likely the converter.
If your in a state that has emmision checks grab your wallet if not this light don't come on thill it's at about 96% which means your still not polluting that bad. Also a miss firing cylinder can sometimes trip this code.
To me it sounds like your ride needs some TLC! Hope this helps
John
What else can I help you with?
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