From Ford: EMISSIONS PERFORMANCE WARRANTY COVERAGE
If your vehicle is registered in a state where the state or local government has
an EPA-approved inspection and maintenance program, you may also be eligible
for Emissions Performance Warranty Coverage for 2 years or 24,000 miles
(whichever occurs first), if you meet the conditions listed below in this section.
Under the Emissions Performance Warranty for passenger cars and light duty
trucks, Ford Motor Company also provides coverage, including labor and
diagnosis, for 8 years or 80,000 miles (whichever occurs first) for the following
emissions parts, if you meet the conditions listed below in this section.
catalytic converter
compuvalve
electronic emissions control unit (PCM)
onboard emissions diagnostic device
So, diagnosis and repair from Ford will cost you if it's over 8 years or 80,000 miles (whichever occurs first).
If it is a cat you should have gotten a CEL. You may also have measureable exhaust backpressure.
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