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we have 2000 exped. and seller didnt know code. Heard that it is located in the rear of the truck where the bumper jack is... and i couldn't figure it out. Went to dealer...yikes!! and paid 50.00 to have it reset to factory. had to weigh fustration...locked in keys... and inconvience against my time of not figuring it out.... took 15 minutes at ford....
Sounds like a vacuum leak. Look for obvious vacuum hoses broken,squished or off. Check at egr valve, dpfe sensor & solenoid. These are all common to go bad. If not obvious take carb cleaner with snorkel attached, spray intake manifold & hoses etc. If idle raises while spraying you located vacuum leak. The propelent in the can temporarily seals leak while its being sprayed. Be careful not to spray on wires or anywhere there is a spark.