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I have a 89 ford mustang I have the bank1 oxygen sensor out which side is bank1?

Bank "1" is typically the side that has cylinder #1 . I am not a 100% sure.. but I think Cylinder #1 is the 1st one on the driver side . But the man above me says passenger side.. I could look at a fix manual and find which cyl is #1. then that is gonna be bank 1. Sorry, it is been a while since I built or worked on a 5.0..hope this helps

same side as cylinder one, passenger :

Passenger front is cylinder one and 2,3,4 Driver side is 5,6,7,8 from front to rear.

passenger side I could replace both although..