Blinking rapidly means its the pats system
" it will not allow the vehicle to start (and cause the anti-theft light to blink rapidly while trying)."
We are a tow company. We had the locksmith come out and key this vehicle with his program. He has been working with us and is very reputable. And I know he has done similiar ford taurus for us.
And yes, mine does flash rapidly
Yes we changed the PATS antenna ring, new from dealer
My scan tool says it cannot get a connection