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Fords (and Mercury and Lincoln) are infamous for vacuum leaks. It is possible that you have a leaking vacuum hose, or a missing vacuum system cap, which would make a hissing noise if you open the hood with the vehicle running.

The problem could also be sensor related so find out if it is showing a MIL code and see which one it is, newer cars are made to self diagnose their problems, once you have that starting point you can make some educated guesses as to what to fix first.

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9y ago

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