It's just called an O2 sensor. Tell the parts store which one you need and they should be able to fix you up. They are usually easy to replace if they are not rusted in place. You might try to spray it with some rust buster before you start, but make sure the pipes are cool first.
This web site has dual o2 bypass for only $25 plus shipping. I have used this on my farm rig way cheaper than replacing o2 only works for o2 downstream from cat though. Just sends a signal saying the o2 is working and keeps everything in check
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