2008 Check engine light

If you use the 87 low octane gas all the time try using 89 or 92 octane gas had same problem started using the higher octane gas to make a long story short it took 10 tank fills and check engine light going off and coming on 4 times but light is now off and stays off. Also for got to mention when check engine light first come on the code reader said it was 02 sensor bank one replaced sensor 2 days later back on saying same code that is when I started using the higher octane gas.

I'd look for a vacuum leak before anything else. Here is EricTheCarGuy, How To Find A Vacuum Leak: https://www.youtube.com/watch?v=9CPqbaSgcok