I bought gas. The truck hesitated as I left the fuel station, then threw a check engine light on. It smooth out ok and I drove with the check engine light. It's cold here in NJ. I checked the gas cap twice. No problem. I drove about 20 miles shut down the truck for 15 minutes and the ligth disappeared. Miles 91,500.
2007 Hemi 5.7. I drove the truck for three days no problems. Tonight it showed a check engine light again. OBD II and got codes PO404 and PO406. Sound like an EGR valve? Do you know the valve diagnostic to confirm? Thank you. Regards, Mike