So after my car threw a code for o2 upstream sensor malfunction I went and replaced it. The car has all OEM parts and its 10 years old so the o2 sensor was never changed.
When I took it out this is how it looked:
As you can see it got kind of burned up. I don't know if this is exactly "normal" but it has been 10 years..
Sorry for 2 blurry pictures this camera is an ancient turd