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I did some work on my girlfriends car a few months back, she also has a Toyota Corrola with the same P0420 check engine light code.
First thing I did was checked the gas cap, the seal on the gas cap was bad, 2nd thing I did was had her only run non ethanol gasoline.
3 months or about 4,000 miles later and her check engine light has not come back on, her car is still burning oil but it seems to be burning it and not damaging anything, so that would be my advice, use better gasoline and install a new gas cap as they have a check valve in them that can wear out.
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