I have a 1999 Toyota Solara V6(1mz-fe) with 279,xxx miles and I'm pulling a P0420 CEL. I've tried to…

I have a 1999 Toyota Solara V6(1mz-fe) with 279,xxx miles and I'm pulling a P0420 CEL. I've tried to clean the Cat using one of your methods with the Laquer thinner. I got the CEL to go off for 2 or 3 days, but then it came back on. I'm thinking that it may be the post O2 Sensor, but I'd like your thoughts.

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