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Not solved
On fifth drive cycle since fuel trim fix, the P0420 came back today. Diagnosis testing done. I have an inefficient CAT. I will clean it to see if that clears the code. I'll post those results in my CAT restoration thread.
At least this process taught me new testing techniques and revealed a simple cause for the bad fuel trims.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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