There has got be something wrong with the sensor itself, the wiring, harness, or connections. That's specifically a heated sensor 0 2 Code. A clogged cat would be bad too, but if the code has appeared and you can't clear, I have to think the sensor itself or its connections is the top suspect. Have you investigated the pinout?
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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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