If you have an Auto Zone store near you, they will check the codes for free. That will give you a start.
It could be as simple as a loose gas cap, to something more serious.
I'd try to find an independent shop with a good reputation as opposed to the dealer.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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