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They are screwed into the exaust system at various points. Some people say that there are 4 oxygen sensors, but technically, that is not correct. Only the front 2 are considered oxygen sensors. They are screwed into the exaust pipe, one on each bank, after the exaust manifold, but before the catalytic converter. Sometimes they are screwed directly into the exaust manfold itself. The other 2 are actually called catalyst moniters. They are oxygen sensors, but they serve a different purpose. They moniter the activities of the catalytic converters, thus the name, catalyst moniters. They are screwed into the exaust one on each bank,after, or downstream, of the catalytic converters. Any of those sensors, the wiring to them, or anything that confuses the sensors, like a vacuum leak, or engine misfire, can make the CEL come on.

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โˆ™ 2006-04-05 05:44:50
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Q: Where are the o2 sensors located on a 1995 Windstar and which sensor leaves check engine light on?
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