The limp mode resets itself when you turn off your car for longer than a few minutes. Those codes tell me that you probably had a misfire in cylinder one. It allowed fuel to get into your exhaust and triggered your 02 sensor. I should also clarify that while I have spent a lot of time fixing cars for many people I am not a Professional Mechanic, just a car junky Middle School History Teacher.

If It were me though with the new code information you just gave me, I would clear the codes and see if the code comes back. If it replicated, then I would change out the spark plug in cylinder 1. If it returned then I would swap the coil packs to make sure that the problem isn't in the coil packs. (If it switches cylinders when you switch the coil packs then it is a coil pack problem) All of this stuff is pretty easy and I am sure there are many Youtube videos that walk you through step by step how to do those things.

Just for kicks though, check your battery terminals and make sure they are clean.