Maybe you haven't seen much.

 

hehe...you're absolutely right, what do i know???

 

Well, I should have said I agree that cars are deceiving, symptoms can come and go with changes in the part itself, weather, vehicle temp, vibration and others. For a year and a half, I was confident the condition wasn't created by the O2 sensor. I was plain exhausted and said F-it and started replacing parts. That upstream O2 was the first of several I was going to swap and after replacing, the condition has ceased, also mileage has gotten better. Only code I have now is the 1457. I am absolutely happy to have that one!