I had a check engine light come on Wednesday: P2414.
By Thursday, the light was gone.
Friday, the light came back.

Any thoughts?
I know the P2414 is related to the pre-cat O2 sensor, and I saw an article that said interstate driving could make an O2 sensor check engine light go away (because it is easier for a failing O2 sensor to do its job on the highway versus stop-go traffic).

I have an 09 Base with almost 130k miles.