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Inside the engine.
1500, no. 2500/3500, yes.
It does not have EGR.
2002-1500 to a 2004, yes. 2002-2500/3500 to a 2004, no.
2002-2006 the engine computer is under the dash on the driver side. 2007-2009 the engine computer is under the hood, behind the washer fluid bottle.
35 gallons
Idle is computer controlled and is not adjustable.
2002 Ram 1500- no 2002 Ram 2500, or 3500- yes
A 2002 Ram does not have a cabin air filter.
The engine computer is also the regulator.
The engine computer is also the voltage regulator.
The switch should be replaced.