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  1. 3.9L V6 Specific Topics
    :confused: Hey guys, Ive looked on Advance Auto parts site for the o2 sensors on my 1991 3.9 Auto Dakota and they are only giving me the "Upstream" one. From what Ive researched there are two o2 sensors no?? ..one being before the Cat and one after the Cat..correct? Do these o2 sensors have the...
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