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Got the P0420 CEL again, which indicates trouble in the downstream ("secondary") O2 sensor or inefficient CAT converter operation (or both, I guess). Last time was April 27. But the car has been off the road for half the time since April 27. This is the same tank. Got it under very similar conditions today. I guess I will try the gasoline clean on my O2 sensors. I cleaned the CAT two years ago. It's the 1998 OEM part.
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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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