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Q: How do I find the exhaust system oxygen sensors?
A system check-plugged sensors. on 2004 Ford Freestar

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A system check showed that the sensors are plugged up.
(1) Answer
I guess you mean check engine codes. Here's the diagram http://www.justanswer.com/uploads/wmarti7/2009-06-30_023447_04_freestar.gif
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