O2 sensor where are they all located?

Hello,

This vehicle has 4 oxygen sensors.
Two of them located before the catalytic converter in the exhaust manifold and the other two located after the catalytic converter, in the pipe.

https://www.2carpros.com/articles/how-an-oxygen-sensor-works
https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor
https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

I have attached the replacement procedure for your reference.

Please let me know if you have any questions.
Thank you.