P0057 Toyota - I am trying to buy the sensors I see Upstream, downstream, right and left

Question

Please How do I know which sensor to buy left or right

Answer 1

P0057 Oxygen sensor heater control circuit low (bank 2 sensor 2)

The word "Bank" means group, bank 1 always refers to a area where cylinder 1 is located, bank 2 is where cylinder 2 is located, sensor 1's  are engine managements, sensor 2's are catalytic monitors.What you need to get is bank 2 sensor 2 this is known as downstream or a catalytic monitor for bank2