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Careful in assuming an O2 sensor fault code is actually a faulty O2 sensor. It may be, as they do have a "life", but other things can cause the O2 sensor codes to set.
Maybe check the basics, like 'plugs and leads, engine mech. condition (comp. test?), clean the IACV/throttle body, exh. leak ahead of the sensors, vacuum leaks in hoses and gaskets etc..
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