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Codes are somewhat useless in diagnosing o2 sensors. You need to do data. Are they dead or just reading funky because you have a vacuum leak, stuck injector, misfiring coil etc..... Even a cheap scanner can get you live data and do not erase the code, you can pull up a freeze frame of all the sensors as the freeze frame records at the moment the code is thrown. It could very well be an 02 but you are just guessing.
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