My 2013 Screw 5.0 keeps throwing a check engine light for code P0451 which is "Evaporative Emission Control System Pressure Sensor Range/Performance". I have heard of some fixing this by replacing the fuel tank pressure sensor and others say it was the capless fuel filler neck not sealing. I have tried blasting out the filler neck with compressed air but my truck threw the code again today. What is strange for me is the truck will be parked without the CEL on and the next morning it cold starts with the CEL on. It has never come on while driving or when the truck had already been driven that day. I also have been able to drive the truck long and far enough to clear the permanent trouble code but it usually comes back on within a week. My question to my fellow ford owners is who else has had this problem and what was the fix for it? Thanks in advance.

 

 

I actually cleared the code multiple times and it would randomly come back. Then eventually it never came back now its been gone for several months. I didn't change any parts.

 

I wonder if by adding a fuel cap (if possible) if the CEL would stop returning.