Bank 1 O2 is the upstream one poking out of the exhaustmaniforld in fromt of the valve cover. There are methods for cleaning them. I have never tried. A replacement sensor for non v-tec-e engines is not very expensive. Yes, even without throwing a CEL it will mess up FE, since the ECU uses its signal to adjust AFR.
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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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