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Welcome and congrats!
O2 sensors are NOT that expensive...$74 on Amazon in March of 2015 for OEM Bosch 15182 upstream sensor. Thing is, lots of folks seem to want to replace all 4 at once if one is throwing a code.
My take is that the OBD-II code will tell you which sensor(s) are having issues. First thing I did was note and then clear the code to see if/when it came back. Over the course of a few years, I would sporadically get the same O2 code....maybe once every 6 months or so. Once the code finally started to pop up more frequently, I bought and installed the one offending sensor, March of 2015year. No codes since.
BTW, my 2000S has just under 132K miles.
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