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Q: Are there 2 or 4 o2 sensors? on 2003 Ford Expedition

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I have had numerous problems and various codes ever since the wireing shorted out on the aluminum refrigerant tube (poor design wiring harness lays accross tube and vibration wears the insulation off)
a few months ago the codes were o2 sensors. now "rear o2 sensors. one parts store says there are only 2 the other says there are 4
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