On my 02, I had a code for the driver side rear O2 sensor. I realized that same ground was dangling after a header install- attached it to a good ground, reset light and it's been good ever since. I would connect it to a good ground and reset- it'd be way cheaper than buying new O2 sensors.
2002 Super Black 5 Speed 4x4
AC Shackles/UCAs, BL, 33" BFG ATs, ARB front, Skid Row rear, IAB, Bilsteins, K&N CAI, Magnaflow muffler, Doug Thorley Headers, GPS, Some audio stuff, backup camera. A leaking oil pan.