O2 Sensor? Ride it for a few miles. Allow time for the ECM to re-adjust to having a good sensor again. It may also take a couple of operating cycles for the light to clear.
F4 Customs SWCV, Ultimate, Lidlox, Adjustable Side Vents, Leather Like Grips, SS Grills, Centramatic, Garmin XT2, BajaRon Original Sway Bar w/ Lamonster links, P238