Mazda Repair: 99 Mazda Protege 1.6 L engine, mazda protege, oxygen sensor

Question
Where is oxygen sensor located? Are there any special requirments to changing it out.  Will the engine code reset itself or need to be reset by computer.

Answer
was only asking cause there may have been a few reasons for the 02 sensor code that i could have helped with, but since you knew everything but where it was or what one it was and your negitive feedback  hope your wallet is a lil lighter now and i'm only here to help people from what i've done /seen over the years.  and to think i gave you all 10's on you being a asshole,  stupid me :(