My old neon was an OBD-1, and I could check the codes by turning the key on-off-on-off-on and counting the number of times the check engine light would blink. I dunno if the old Fords did the same thing, but it's possible.
"It isn't what you drive that matters, it's how you drive it"
- Jeremy Clarkson, Top Gear
Ford: Taurus ('91, '01) Focus ('09)
Mercury: Sable ('95)
Dodge: Neon ('95)
Trek: 1000SL ('07)