Both codes are for major leaks in the Evap system which vents fumes from the gas tank to the engine.
Code 455 is for a major leak, and code 457 is for the gas cap which could cause 455.
The codes can set if you run the engine with the gas cap off, or there may be a problem with the cap or other component.
SOURCE: Where is the fuse box in a 1985 Ford Mustang GT convertible
the fuse box is located at the bottom of steering column cover
SOURCE: engine temperature sensor located on a 1998 Ford Mustang GT
Left hand side (if facing it), behind distributor, above oil fill.
SOURCE: 2004 Ford Mustang GT.
this code number doesnt exist in my ford code table so try the code reader again and see if you read it right or this code reader has its own codes
SOURCE: engine code po456 on a 2005 mustang gt
It's a code related to an EVAP leak in your emissions system. A lot of people have reported loosening their gas cap, re-tightening it, and then clearing the code with success in it not coming back. Here is a bulletin posted on the issue from ALLDATA
http://ww2.justanswer.com/uploads/paynlessauto/2009-10-05_203445_fueltsb.pdf
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