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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 2003 Ford Explorer has 12 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
how many o2 sensors on a ford e350 van 2003
My Chilton repair manual - engine wiring schematic shows ( 2 ) heated oxygen sensors for the 1993 Ford Explorer
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In a 2003 Ford Explorer : The gas tank size is ( 85.2 liters ) if that is what you are asking
( 16.8 gallons ) in the 2003 Ford Explorer Sport
My 1995 Ford Explorer with 4.0 L OHV has 2 oxygen sensors (Helpfull)