Hello to all! I have a 2001 Ford Explorer Sport V6 4x4 and the check engine light came on last month. The trouble code I get is odb2 1451. I replaced the gas cap, cleared the code, it went away for a week or so but came back on a few days ago. If I untighten and retighten the gas cap and clear the code it will stay off for a couple starts of the engine but seems to keep coming back again?! Is there anything else I should be looking at to fix this problem? Any replies are greatly appreciated in advance!!!