The 539 code is irrelevent to your primary problem, i.e., not starting. Ignore it for now. FWIW, the 539 is likely due to a fault low pressure switch, a PCM input circuit, or faulty wiring.
Focus on the no start condition first.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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