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@bq
Mine is completely stock, so it has 2 cats going into a single backbox (with a funky stacked exhaust tip.)
Looking at service history, both bank 2 sensors were replaced 5 years and 10,000 miles ago. Both bank 1 would appear to be originals which would make them 6 years and 50,000 miles older. Hence it doesn't make sense for them both to fail at the same time.
Oh well, we'll see. If it is the sensors, that's cheap. If it is the cats that's fucking expensive.