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Question edited for clarity.
Question moved to sub category.
Generic answer for all vehicles with two banks.
Bank 1 means it is at the engine side with cylinders 1, 3, 5, etc. Bank 1 Sensor 2 is the second sensor on the engine's exhaust pipe, usually behind the catalytic converter on the way to the muffler.
And specifically locating and changing on your vehicle. Buy OEM sensors not cheaper alternatives.
changed the wrong sensors
the code (p0057)refers to the heated oxygen sensor (HO2S) which is in the exhaust manifold before the cat converter
code p 0172 refers to system too rich bank bank 1===causes ---intake blocked ---EVAP canister purge valve --- fuel pressure---EGR systems ---injector/s---HO2S
If you replace the HO2S sensor/s then that will [robably fix all codes
the heated oxygen sensor reads the exhayst gas and reports to the ECM to adjust the air /fuel ratio to get the engine to run within parameters
when it is not working , it runs lean or rich
The oxygen sensors are on the exhaust pipes in front and behind the catalytic converter(s). Bank two is the side with cylinder number 2, and sensor one is in front of the cat.
Engine cylinders 1, 2 and 3 is bank one cylinders 4, 5 and 6 is bank two, so standing in front of the car the the rear of the engine is bank 2. FYI, both the bank 1 and 2 Oxygen sensors (if that is what this question was about) should be changed as one repair, otherwise an imbalance can occur in fuel control due to signal differences due to normal aging of the sensor. Always use high quality sensors like BOSCH (OEM) or DENSO
If you stand if front of the vehicle bank 2 is on your right, (counting starts from left, facing the engine), and sensor one is the before before catalytic converter.
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