I have 1999 Mercury Grand Marquis, there is a problem with the security system, had to get a key reprogrammed twice, and the second time it did not work, is there a way around the security system, car is on last legs not looking for major repair

Ford EECIV computer system no by-pass. Confirm with the locksmith that he did NOT just "clone" a key which is just a RFID copy of the key you had, and that he did ENTER a NEW key CODE in the EECIV computer, which is the correct method, a cloned key should NOT cost more than $60

Okay, I will have to give them a call once I get out of work to see if he did enter a new code rather than clone the key, if he did enter a new key code, and this problem did reoccur, could the driver side door not locking properly or being open from the inside cause the car to go into a security safety mode?

I have a 2001 mercury grand marquis that suddenly stop turning on. The computer code showed that it was a anti-Theft issue. The electro mechanic I took it to was a repoff and want to charge $85.00 to diagnostic it after he performed a computer reprograming of $500.00 a month ago. I heared that it could be a fuse problem... please advise!