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These cars are a little weird in that they always seem to throw catalyst threshold codes on BOTH banks simultaneously. It'll never just do one side or the other, which is annoying because it eliminates the troubleshooting step of swapping sensors to identify sensor vs cat.
(The stupid harness couplers are different front/rear too)
It doesn't effect the car's performance at all. It just throws the code for emissions failure.
Only way to find out is to install two new sensors.
I have fouled cat's due to a nasty oil ingestion episode a few years back.
My car has double-stacked spark plug anti-fouler spacers, with with about a 1/4" hole letting exhaust gasses access the sensor in the down stream ones.
It works pretty good. The DME still knows something is wrong. It always has O2 malfunction codes in the DME but it only very rarely throws a malfunction lamp based on US OBD emissions thresholds. Usually after three consecutive highway speed drive cycles. Your car may vary as non-US emissions failure thresholds may be different.
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Sometimes a bolt is just a bolt.
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