Number of oxygen sensors

Hi Doc

This is an inline six cylinder. This truck only has two. One upstream and one downstream.

Hello,

This vehicle has 2 oxygen sensors.
One located on the exhaust manifold (upstream), and the second one is located after the catalytic converter on the exhaust pipe (downstream).

Here is a helpful guide on replacing oxygen sensors:

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

I have attached diagrams as well as replacement procedures for both of the sensors below.

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