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You definitely need to test the circuit for that O2. That is a circuit code. It is probably the sensor. It could be an open in the circuit, even an intermittent one. Don't spend your money on an O2 without testing. Testing is easy. Though you may end up in the same place, you will know you are in that place, rather than having guessed. If it is an open in the circuit, the fix could be quite a lot cheaper. To me this is good eco practice too: not trashing and replacing perfectly good parts.
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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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