AFR gauge says super rich

Yes, I had one go bad a couple years ago. Not as bad, but it did start drifting.
I'm well the plx o2 sensor came in and it doesn't fit apparently they changed their plug size so money down the drain weirdly I put the other one back in and boom it was working again I checked the box and nothing out of place that I could tell so I don't know further test required
 
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