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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.
You'll need to remove the air box to see it. CPS is mounted directly under your alternator, recessed in the "square tunnel" area next to the EGR. Look for it from the passenger's side. It's only meant to be changed every 100k or so, it's not easy to find, but is easy to change.