OK, this is driving me nuts. It's a 4 cylinder with two banks and 4 sensors. Alldata only talks about "left" and "right" banks. Left is 2 & 3 and right is 1 & 4. So is bank 1 left or right? No guessing damn it.
you answered your own question bank 1 is 1-4, alldata is that a computer based site or type of code reader. if all else fails go to auto zone have them scan it and tell you where it is.