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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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Q: How many o2 sensors on a 1998 Ford Explorer sport?
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