No problems, it's just a reminder to replace your O2 sensor. You reset it by pushing the switch under the dashboard. IIRC, it'll be just above your left knee as you sit in the driver's seat. You can see it thru the top of the dash if you remove the speaker, but I've never been able to reach it that way. I've only reset my son's twice, but each time I've pulled away the underside dash padding/covering to reach it.
There's a cable that comes off the back of the instrument cluster, and goes down to the box that triggers the light. Follow the cable down to the box. The reset switch is on the side of the box. I don't remember how you access the switch though