How many o2 Sensors does my vehicle have and where are they located?

Your vehicle has 3 sensors total. Two sensors are located in the exhaust pipe just past the exhaust manifolds. The third sensor is the catalyst monitor and it is in the pipe past the catalytic converter. I have attached a parts diagram.

Which o2 Sensors fit each location? Example: upstream or downstream.

Upstream are before the catalytic converter, downstream are after the cat.