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I had 0420 several times on Corolla. Still on the same cat, same sensor, same canister. Just a matter of cleaning... Its been 2 years since last cleaning and no code yet.
Edit: Make that more than 3. Last renewal, we did not have it though I did the seafoam cleaning. We have a renewal next week so I am doing another seafoam cleaning treatment. I normally do one annually.
Also on our honda, after a 0420 that came back couple times, I had installed a spacer. It has been 5+ yrs now since and no code. I had posted that several times on subforums also.
2002 Avalon XL 3.0L mcx20L 1MZFE
2004 Camry LE 2.4L ATM 2AZFE ACV30L-CEPNKA 4FC
2000 Corolla CE1 4 Cyl 1.8L EFI ATM 1ZZFE ZZE110L-DEPDKA SED 4FC
Last edited by surgeon0; 10-27-2016 at 12:10 PM.