2000 Toyota o2 4runner

[Funcrazy1]

I cant find the parts number for the front and rear o2 sensor for my 3.4 automatic. It has no cat to begin before I bought the 4runner it had a cat but he removed it before he sold it to me cause our state requires no emissions testing but it was throwing the p4020 error code before the cat was removed. So should I even bother replacing them ?:wow:

 

[MStudt]

This information is everywhere. Look here and you'll find what you need.

 

[Funcrazy1]

Ah okay I found I was over looking I was getting angry so I overlooked ! Thank you so will this make a difference with the error code since I have no cat ?