your post cat o2 sensor is bad bank 1 is passenger side.
Bank 2 is drivers side.
bank 1 sensor 2 means that the pass side post cat sensor is going.
They are 100000mile units so you should replace all 4.
Dealer over 200 a unit.
me $210 for all 4 with instructions.
you can get to the front ones via the hood
The post cats via a car ramp or floor jack and jack stands.
Your power will return along with up to a 15% INCREASE IN MPG.
WAITING ON O2 SENSORS will decrease the life of your cats as well as your mpg and performance.
You need 4 2 pre and 2 post. I don't know about those amazon folks at times 3?????
Them $310 for 4