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 MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1420 (ANTI-THEFT SYSTEM - PASSIVE ANTI-THEFT SYSTEM (PATS))GENERAL PROCEDURESSPARE KEY PROGRAMMING - UNLIMITED KEY MODEDISABLING UNLIMITED KEY MODE
2009 Mercury Milan Premier, 3.0 1, AWD
Disabling Unlimited Key Mode
2009 Mercury Milan Premier, 3.0 1, AWDSECTION Disabling Unlimited Key Mode
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. 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.
- Enter security access. For additional information, refer to Anti-Theft Security Access .
- 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.
- Turn the first PATS key to the OFF position and remove the 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 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 using the Key Programming Using Two Programmed Keys procedure. 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.