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 MANUALSFORD2010MUSTANG BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 753 (ANTI-THEFT SYSTEM)GENERAL PROCEDURESSPARE KEY PROGRAMMING - UNLIMITED KEY MODEDISABLING UNLIMITED KEY MODE
2010 Ford Mustang Base, 2D Coupe, Automatic
Disabling Unlimited Key Mode
2010 Ford Mustang Base, 2D Coupe, AutomaticSECTION Disabling Unlimited Key Mode
WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
By disabling the unlimited key mode, the previous access code no longer operates the vehicle.
- From the scan tool, follow the on-screen instructions to ENTER SECURITY ACCESS. For additional information, refer to Anti-Theft Security Access in this article.
- Select: "unlimited key mode OFF" and press the tick mark.
- Select: "Ignition Key Code Erase" and press the tick mark.
- Disconnect the scan tool and turn the ignition switch to OFF.
- Insert the first PATS key into the ignition lock cylinder and turn the key to the ON position for 3 seconds.
- Remove the first PATS key from the ignition lock cylinder.
- Insert the next PATS key into the ignition lock cylinder and turn the key to the ON position for 3 seconds.
- If it is desired to program an additional key(s), refer to Key Programming Using Two Programmed Keys in this article for each additional key that needs to be programmed. The PID SPAREKEY must be enabled.
NOTE:
With the unlimited key mode turned off, a maximum of 8 keys can be programmed into the PCM. For additional information, refer to Key Programming Using Two Programmed Keys in this article. The PID SPAREKEY must be enabled.
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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.