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Message: [QUOTE="Long Gone, post: 1529845, member: 31343"] Got new MAT sensor and get the same results (-40 when plugged in and 419 unplugged) as with the original. Very consistent from one sensor to the other. No change in temp reading with movement of the wiring harness, and am not finding any loose/corroded grounds. Since the MAT (IAT#2) is an input to the PCM I am thinking the PCM is having a problem. The temp read out in the cab seems to read correctly so it must be getting it from somewhere else (IAT#! or ?). Does anybody know if there are any upgrades or any changes made through the years, are the different years interchangeable or anything else I need to know. [/QUOTE]

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