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That would depend on what year of Ford Explorer and which engine you have ( my 1995 Ford Explorer with the 4.0 liter OHV , V6 engine has ( 2 oxygen sensors )
The 2013 Ford Explorer has 24 valves.
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On a 1995 Ford Explorer : There are ( 2 ) oxygen sensors ( I believe there is one sensor in the outlet of each exhaust manifold )
there are 4 o2 sensors
My Chilton repair manual - engine wiring schematic shows ( 2 ) heated oxygen sensors for the 1993 Ford Explorer
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My 1995 Ford Explorer with 4.0 L OHV has 2 oxygen sensors (Helpfull)
There are 2 oxygen sensors.
The 2013 Ford Explorer's engine produces 290 hp @ 6500 rpm.
According to the 2013 Ford Explorer Owner Guide : ( 18.6 U.S. gallons )