Not a Ranger but my other car I took the egr off and blocked off the manifold and exhaust ports. Been running it like that for years with no problems.
The egr lets hot burned exhaust gas into the combustion chamber to cool the engine down when it gets to hot or when it's under a heavy load for sometime.
If your engine never get hot while under a load you will never notice the egr opening.
If you decide to take it off, you can fool most computers with either a resistor or switch wired into the circuit. Depending on the system, you either stop the signal that the computer uses to determine status or change its value with the resistor.
Take it off and see what happens.
2001 Edge Chrome Yellow ORP 3" body lift 4.0L 5 speed auto
Kenwood DDX6019 with NAV and Bluetooth
Two Kenwood KAC-7203 powering Four Polk Audio Momo MM571 5" X 7"
Kenwood KAC-8103D driving two Polk Audio Momo 10" MM1040 DVC
200 amp alternator and a Boss Audio 3.5 farad cap to keep things bumping.
1994 Mazda MX5 (Miata) Turbo 274 hp 232 ft lbs torque
2005 Honda R12X Aquatrax stock
2007 Honda TRX450R lots of mods