Updated TSB For O2 Identification
 

This service bulletin provides information on the proper identification of engine bank 1 and engine bank 2 for correct A/F sensor and oxygen sensor replacement.

http://www.toyotapart.com/Engine_Ban...SB-0398-09.pdf

:bigok:

I don't know why they included the 5VZFE in that TSB, the sensors are after the crossover and therefore both bank 1 & 2 use the same sensor. :con: Maybe just to ID what side is bank 1.