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I'm not a mechanic but looking at the engine wiring schematics , for 1991 and 1992 models , I only see ONE heated oxygen sensor. ( which happens to have a 15 amp fuse in location # 18 of the fuse panel ) it is referred to as an upstream o2 sensor. I'm not sure exactly where it is located, but it is threaded into the exhaust pipe close to the engine or one of the exhaust manifolds.

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โˆ™ 2007-12-04 23:29:08
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Q: Where are the o2 sensors on a 91 ford explorer located and how many are there?
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