A couple of days ago my CEL came on with the codes for the right bank o2 sensor and the rear o2 sensor. This has happened everyday I have started it up since Saturday because it has stayed on all during this times for the period I was driving it.

But today the CEL has gone off and does not come back on. Even after start it and driving around. The weather here in Atlanta has changed from cold to warm in this period but I dont think that is a factor. I have not reset the ECU since Sunday. I thought the only was to pick the CEL was to reset it once you have fixed the problem. I have not done anything to make this CEL go from on to off.

What is the problem?? Should I just forget about for now since it has gone off. Or maybe find a OBDII scanner and see what comes up?