I do have one question before i buy air fuel. Like the guy said above last year i replaced this same sensor with one from autozone and had to change connector per autozone guy. Once we got done putting it in the light was reset and the code went away. Now a year later it has came back and giving the P1155. Since i replaced it with the regular o2 sensor first time and it worked, is it possible that the same thing now needs a air/fuel and not regular o2? Just want to make sure i get right thing before i spend the money.Or is there anyway to be able to tell which one it needs?