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Does the wiring for oxygen sensors a 1997 4.0litre engine Ford Ranger have in line fuse it?

No, the oxygen sensor wiring on a 1997 4.0L Ford Ranger does not typically have an inline fuse. The protection for the oxygen sensors is usually provided by the Powertrain Control Module (PCM) itself, through its internal circuitry and current limiting. A blown oxygen sensor itself would typically be the failing component rather than a fuse blowing in the circuit. Damage to the wiring harness is another possibility leading to sensor problems, but again not usually a fused circuit protecting it.