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Originally Posted by root_werks
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Other thing I was going to try this weekend was swap O2's from side to side. See if I get a P0420 instead of a P0430. If I do, then I know one of my new O2's is probably bad.
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You didn't mention it but I'm assuming that you will be swapping the "after cat" O2 sensors from side to side, as these are the ones whose signal is compared to the "pre-cat" sensor to determine cat efficiency (a required readiness monitor under OBD2 mandates) and sets the P0420/30 code when the efficiency falls below a predetermined limit.
Regards,
paul...