DTC's?
So what you are saying is that once I post a code 34, solid: meaning the light came on and stayed on until I turned the car off and on again. Then its no longer checked?
I have always had this problem when I start the car when its already warm. So the EGR is actually defective, but can only tell me when the car is warm, so it posts?
If I have that right?
1)it makes sense for me to review the NEW EGR test proceedure , now that I know where the EGR solenoid is,
2)Diagnose and repair, and
3)that should fix my high NOx reading????