Help verify o2 sensor part number please!

[gbaker]

2008 4R Sport, V8
P0420 - more specifically o2 Storage B1 Fail (see pics)

I'd like to try to change the o2 sensors before considering the horrendously expensive cat / exhaust replacement.

I've tried to find the right part number, but I'm still very confused since there are multiple sensors. I attached a pic I found in a youtube video, not sure if that helps?

Any other advice is welcome. I know little to nothing, so max detail is helpful and no reference/helpful tip is too minor.

Planning to buy denso from either Rockauto or Amazon, feel free to link directly if that's even easier. Thank you!

 

[Zero0575]

This code is in relation to the data being reported by the downstream O2 sensor. Your diagram that was included doesn't apply to our 4runners. We only have a total of 4 sensors - 1 upstream and 1 downstream per bank.

Denso part #2344261.

 

[MikeinNH67]

Careful with Amazon unless it's Denso themselves selling them. From what I've seen though, codes P0420 & P0430 are not usually fixed by changing the o2 sensor. Exhaust leaks can cause them and of course a cat that is getting old. Some fool the system with extenders (plug defouler) and one person here covered the end with something that looked like a thimble. Thread was called something like "say hello to my little friend".

 

[FrontRange4]

I don't think that is the correct diagram at all. Maybe try rock auto?

 

[gbaker]

Thank you x3. I deleted the incorrect image. I've found the right o2 sensor on Rockauto, now to find a correct diagram.