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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
2/1 is the front one (the one on the engine side of the cat) on the passenger side and most likely needs to be replaced if the wiring and connector is OK.