Autozone's motivation in reading codes is to sell parts, not to repair your
vehicle. Even if they honestly wanted to help, their sales persons are not
exactly trained mechanics with extensive knowledge of every vehicle on the
planet. Return the sensor that you have not yet used and post the numeric
trouble codes here. There is about 95% chance that the source of your
problem has nothing to do with oxygen sensors (there are 4 of those, by the
way).