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Update
Last week, near the end of a 130 mile drive day, the p0420 code came back. I cleared it and it has not come back yet after several driving cycles (none even remotely close to being as long at 130 miles). But I suspect it will come back. I got about 6000 miles of trouble-free operation from the OEM 1998 CAT since cleaning it. I wonder if it is possible if, when the engine gets really warm from a long drive, that a little oil slips past the rings and/or valve seals and starts messing with the CAT.
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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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