I scanned my car and these codes came on, I know it's the oxygen sensors but I don't know which ones they are.

First one was "HO2s heater control circuit low bank 1 sensor 2"

And the other one was "HO2s heater control circuit low bank 2 sensor 2"

What are they? Left? Right? Upstream? Downstream? lol I really need help. Thanks in advance!

 

Bank 1 and 2 refer to the cylinder banks on the engine. Since you have codes for both, then both sides are affected.

Sensor 2 i believe is the furthest downstream.


You don't have test pipes of aftermarket cats do you?

 

^^ This. Sensor 2 is downstream. Sensor 1 would be upstream.