How Many O2 Sensors Does A Mitsubishi Endeavor Have?

How Many O2 Sensors Does A Mitsubishi Endeavor Have? Oxygen sensors are located before and after the catalytic converter. A vehicle may have two to five oxygen sensors, and sometimes even more. How many O2 sensors does a 2006 Mitsubishi Endeavor have? Where can I get instructions or a manual on replacing the 4 oxygen