Hey All,

I am currently trying to find the culprit of a p0411 CEL on my 97 Mustang Cobra. I have replaced the Secondary air pump and the valve solenoid as well as some of the hoses around it. I'm at a loss and so is my mechanic as this thing is still there. My question for yall is, would adding an 02 Sensor delete cause the CEL to go away?