Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1999MUSTANG GT, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONCOMPUTER RELEARN PROCEDURESCOMPUTER RELEARN PROCEDURESMUSTANGKEY PROGRAMMING - ERASE ALL KEYS & PROGRAM 2 KEYS
1999 Ford Mustang GT, 2D Convertible, Standard
Key Programming - Erase All Keys & Program 2 Keys
1999 Ford Mustang GT, 2D Convertible, StandardSECTION Key Programming - Erase All Keys & Program 2 Keys
- Insert Ford Service Function (FSF) card into NGS tester. Turn ignition switch from LOCK to RUN position. With NGS tester connected to vehicle, enter instrument cluster then select SECURITY ACCESS PROCEDURE. This procedure will take 10 minutes to perform. After the security access procedure has been completed, a new menu will be displayed with command options. Select IGNITION KEY CODE ERASE.
- Turn ignition switch to LOCK position and disconnect NGS tester. Insert first encoded ignition key into ignition lock cylinder. Turn ignition switch to RUN position for 3 seconds. Turn ignition switch to LOCK position and remove first encoded key.CUSTOMER PREFERENCE INDEX (MUSTANG)
Module Configurable Item State Instrument Cluster Enter Security Access Enter Security Access Instrument Cluster Ignition Key Code Program Program Ignition Keys Instrument Cluster Ignition Key Code Erase Erase All Stored Ignition Keys Instrument Cluster Spare Key Enabled, Disabled Instrument Cluster Parameter Reset Reset Security ID - Within 5 seconds, insert second encoded ignition key into ignition lock cylinder. Turn ignition switch to RUN position for 3 seconds. Turn ignition switch to LOCK position and remove second encoded key. Both encoded ignition keys should now start vehicle.
NOTE:
Security access must be granted to erase ignition keys, enable/disable spare key programming switch, or perform parameter resets for instrument cluster and PCM. This procedure has a 10-minute time delay prior to granting security access during which the New Generation Star (NGS) tester must remain connected to vehicle. After security access has been granted, security access command menu is displayed which offers various command options. Multiple security access commands can be executed (if necessary) prior to exiting security access command menu. Execution of all necessary security access commands prior to exiting command menu avoids the performance of an additional security access procedure and the associated 10-minute time delay.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.