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I don't think there were any 7 wire O2 sensors n 1989 or since. Time to start rechecking what has already been checked. You need the factory manual, though I guess Chilton's or Haynes's will do. I still suspect the wiring and the pinout. You now have a second known good O2 sensor in place and you still get the heated O2 code? There is an open in a wire somewhere, or a false connection. It needs careful, determined, methodical testing. I am not sure I'd trust anyone else's eyes but my own at this point--even a mechanic.
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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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