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briogio,
Don't know in your case.
I acquired a '96 Nissan hardbody pickup XE 4 cylinder. The check engine light was on when I got it. It ran pretty good but I knew it wouldn't pass emissions with the CEL on.
After parting with a 100 dollar bill at one of the parts jobbers I see why the old EGR had never been changed. The previous owner (a relative) said the light came on ten years ago and his friend/mechanic said not to worry about it. The EGR valve is back near the firewall and changing it must be similar to what childbirth is like. The old EGR was jammed up with exhaust debris (I can't remember what position the valve was in), I tried cleaning it but would take a great deal of work to get it up and running again.
The new EGR did seem to help how well the engine runs, and unhooking the battery straightened out the CEL light. I changed it as soon as I got the truck, so no MPG comparison could be made before/after.
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