Gas Cap Warning Light
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Junior Member
Joined: Mar 2006
Posts: 4
Likes: 0
From: Dunlirk, Indiana
Gas Cap Warning Light
I have the second gas cap warning light coming on after I replaced the gas cap on my 2002 F-150 4WD. I cleared the computer as some have suggested. What could be the problem?
Senior Member
Joined: Feb 2006
Posts: 120
Likes: 0
From: Ohio
You probably have a gross evaporative emissions leak. DTC P0455. On some newer models, the Check Gas Cap lamp will illuminate when this problem is detected by the PCM. Usually a cap that wasn't installed correctly after a fill up is the cause. If the gas cap didn't fix the problem then you need to have it diagnosed as you have another problem somewhere in the system. Best of luck!