I have 2006 Hyundai Elantra GLS. Check engine light came on. Took it to O'reillys to have a diagnostics and came back P2626, P0030 codes. Can someone explain what this means. I know it has to do with the Oxygen Sensor but does that code say which one (or both) and does it say exactly what the problem is with the o2 sensor. The light doesnt stay on all the time. It goes off periodically (doesnt blink).............comes on for a few days goes off for a few days. I filled up with gas today and it went off.

Thanks,
Greg