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It or they are either screwed into the exhaust manifold(s) or exhaust pipe. The 1991 and 1992 4.0 L OHV engines have 1 oxygen sensor The 1993, 1994, and 1995 4.0 L OHV engines have 2 oxygen sensors The 1996 and newer 4.0 L OHV engines have 3 oxygen sensors The 1997 and newer 4.0 L SOHC engines have 4 oxygen sensors The oxygen sensors installed "upstream" before the catalytic convertor(s) are used for engine management The oxygen sensors installed "downstream" after the catalytic convertor(s) are called catalyst monitors and monitor the efficiency of the catalytic convertor(s)

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17y ago

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