when you turn key light should come on the go out if it flashes fast the the pats or ecu not reading the key,try useing the spare key b4 you do any thing else,the other thing u can try turn key on and leave after aprox 1 or 2 mins the pats imo light may flash a code EG X XXXXXX will be flash code 16 then look up code on internet or ask fords or local mechcanic/auto locksmith