I have found the 2 obvious o2 sensors, one on the exhaust manifold and one downstream behind the catalytic converter. Does this model with the mitsubishi 6G72 have any others? Itreid to search but didnt come up with much. thank you for the help.

 

"V"-type engines usually have an O2 sensor on each exhaust manifold and if there is a catalytic converter for each manifold there will be a sensor downstream from each cat.

My 2.7L V-6 is built that way. The sensors on the rear bank of cylinders are not visible from above and are hard to get at from below.