Anti theft prevent car from starting

HOTSAUSE

MEMBER
1999 LINCOLN TOWN CAR
7 MILES

I lost my car key when my car was still on. Four different Locksmith made a key and tried turning on car. It cranks but doesn't start. A mechanic looked at car and started it but said that anti theft is keeping it from turning on.

Thursday, March 28th, 2019 AT 5:29 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Welcome to 2CarPros.

If you have lost the original keys, you have to erase the original key codes and reprogram the system to recognize the new ones. Here are the directions. You will need a specific type scanner to complete the procedure.

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KEY PROGRAMMING - ERASE ALL KEY CODES AND PROGRAM TWO KEYS
Special Tool: New Generation Star (NGS) Tester

Picture 1

SPECIAL SERVICE TOOLS

NOTE
This procedure is used when a customer needs keys programmed into the system and does not have two programmed ignition keys available. This procedure is also useful when programmed ignition key(s) have been lost or the ignition switch assembly has been replaced, and it is desired to erase key(s) from the Passive Anti-theft System (PATS) memory.
This procedure will erase all programmed ignition keys from the vehicle memory and the vehicle will not start until two keys have been reprogrammed to the vehicle.
Two PATS encoded keys with the correct mechanical cut must be available to perform this procedure. One or both of them may be the customer's original keys.
If additional keys are to be programmed, refer to Key Programming - Program a Key Using Two Programmed Keys. See: Antitheft and Alarm Systems > Procedures > Key Programming - Program A Key Using Two Programmed Keys
If the remaining keys are with the customer and are not available with the vehicle, then instruct the customer to refer to the Owners Guide under the "Programming Spare [SecuriLock (R) (North America), Safeguard (R) (U.K.) Or PATS for all other markets] Keys Procedure" for instructions on programming the remaining keys.

1. Turn the ignition switch from OFF to RUN.
2. Enter New Generation STAR/Service Bay Diagnostic System (NGS/SBDS). Follow the SECURITY ACCESS PROCEDURE to obtain security access.
3. From NGS/SBDS menu, select IGNITION KEY CODE ERASE.
4. Turn the ignition switch to OFF and disconnect NGS.

NOTE: Do NOT select any additional commands from this menu.

5. Insert the first encoded key into the ignition lock cylinder and turn the switch to RUN for three seconds.
6. Insert the second encoded key into the ignition lock cylinder and turn the switch to RUN for three seconds.
7. The vehicle should now start with both ignition keys.

Let me know if this helps or if you have other questions.

Take care,
Joe

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