RGR or do you mean EGR? O2 sensors do go bad over time, usually fairly high mileage.
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2003 Ram 1500 QC Hemi Lonestar "Big Red" & 2006 Charger R/T "Little Red"
SRT-10 suspension, brakes and interior parts, Circle D, Bilsteins, Superchips, AiRaid, Taylor shorties, McGaughy's shackles, Borla cat-back, Extang Tonneau, Sonnax, Power wire, Daytona lip, tow mirrors, SRT hood.
Mods to come: 06+ coil conversion, Comp 260 install, 05 PCM conversion.
Sarcasm - it beats killing people.