The O2 sensors are located on the exhaust of the vehicle. The first O2 sensor will be located beyond the manifold and before the catalytic converter, then there is typically one or more beyond the catalytic converter. to change them you have to unplug the wire at the connecter (generally about 6" from sensor) then simply unscrew them with a wrench out of the exhaust pipe. they may come out hard from repeatedly being heated and cooled.
On a 1998 Ford Explorer Sport : If it has the 4.0 litre EFI engine ( which is an over head valve / pushrod design engine / the 8th character of the VIN is an " X " ) there are ( 3 oxygen sensors ) If it has the 4.0 litre SOHC engine ( the 8th character of the VIN is an " E " ) there are ( 4 oxygen sensors )
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