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 MANUALSFORD2004MUSTANG BASE, 2D COUPE, 3.9 6, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1838 (ANTI-THEFT SYSTEM - PATS - (HYBRID))GENERAL PROCEDURESKEY PROGRAMMING SWITCH STATE CONTROLUNLIMITED KEY MODE PROGRAMMINGENABLING UNLIMITED KEY MODE
2004 Ford Mustang Base, 2D Coupe, 3.9 6, Automatic
Enabling Unlimited Key Mode
2004 Ford Mustang Base, 2D Coupe, 3.9 6, AutomaticSECTION Enabling Unlimited Key Mode
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Unlimited Key Mode is intended for use by those customers who need more than 8 keys for their vehicle.
- The customer must choose a 8-digit, non-00, 00, 00, 00 number that will be programmed to all of their vehicles. All customer vehicles need to use the same number. Valid digits are 0-9 plus the letters A-F.
- Note: If the powertrain control module (PCM) PID: UNLIMITED TRANSPONDER KEY ID is not available the Unlimited Key Mode is turned on, and must be turned off before viewing the stored code. To view/change the stored code, follow the procedure for turning off the Unlimited Key Mode below. Check the PID: UNLIMITED TRANSPONDER KEY ID and compare its value against the code chosen in Step 1.
- Using the scan tool, select PCM from the menu. Follow SECURITY ACCESS to obtain security access. For additional information, refer to Anti-Theft Security Access .
- Turn off the unlimited key mode to view the security key PID.
- If the Unlimited Transponder Security Key PID was 00, 00, 00, 00, select Active Command: SET UNLIMITED TRANSPONDER KEY. Enter the 8-digit code chosen by the user.
- Select: ENABLE UNLIMITED KEY MODE/RESET procedure BIT, if applicable.
- Select: IGNITION CODE ERASE.
- Disconnect the scan tool and turn the ignition OFF.
- Program 2 ignition keys to enable the vehicle by cycling the keys from OFF to RUN.
- Program any additional keys using either Key Programming Using Two Programmed Keys or Key Programming Using Diagnostic Equipment .
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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.