Now what?!?

Your pic shows an O2 plug on the right and you said it's what you need. You did not mention a 2000.5 California Emissions compliant due to the fact you had no under hood Emissions sticker and you made a joke about California falling into the sea when I questioned you about California .

 

what the...?!

Your connector says O2, but what does the probe says?

the connector with the two notches is O2, but what does your old sensor probe looks like? O2 probes have rows of 4 holes while A/F probes have rows of two holes (like the picture you posted from Amazon)

oh and by the way, you can't swap O2 with A/F and vice-versa. Truck will be unhappy and throw codes

 

I don’t remember. It’s still in truck, I believe it has many holes (if I remember correctly) obviously the truck needs what the harness needs (O2) I just don’t understand the Toyota numbers suggesting otherwise. I will order a 4162. At this point what’s another 50 bucks.

 

Post pictures of the sensor itself.

I got a fake Denso air/fuel sensor of fleabay a couple years ago, and it caused me all sort of headaches until it was swapped.

 

For future reference air/fuel on Right. O2 on left of pic

 

Now you're on the right track.

 

Rockauto is also a retailer that specializes in auto parts so they have that going for them.

Ebay, like Amazon is not in the business of being experts on auto parts and getting you the correct part you need. They just sell you someone else's stuff.