Hi there!The vent control code indicates you have a leak in the evap system.You need to have the evap system smoke tested to find the leak.The computer is just saying there is a open hole in the system because it can't pull a vaccum when it does the self test.Check the label under the hood to make sure there is not a vent control valve,most vehicles have them and they are usually located next to the charcol canister.The smoke check will show the location of the leak quickly and once diagnosed you may be able to perform the repair and save a few dollars.Hope this helps!Thanks

OK.The next thing to look at is the pressure sensor then.You will need a scanner to view it,but if the system doesn't have a leak then the pressure sensor may not be working or sending false info to the pcm.You usually can watch the pressure sensor voltage change with the pressure in the evap system,if it doesn't change then the ecm will see it as a leak in the system.

I'm sorry for butting in, but I looked up this code in the Ford PCED:

DTC 1451 is for an electrical fault in the cannister vent solenoid circuit. The canister vent solenoid is mounted to the charcoal canister above the spare tire.

If the circuits check out good (No shorts to ground, power or opens) you probably have a faulty cannister vent solenoid.

Thanks,

Loy