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 MANUALSLINCOLN2006TOWN CAR EXECUTIVE L, 4.6 VREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSANTI-THEFT SYSTEM - PATSGENERAL PROCEDURESKEY PROGRAMMING SWITCH STATE CONTROLUNLIMITED KEY MODE PROGRAMMINGENABLING UNLIMITED KEY MODE
2006 Lincoln Town Car Executive L, 4.6 V
Enabling Unlimited Key Mode
2006 Lincoln Town Car Executive L, 4.6 VSECTION Enabling Unlimited Key Mode
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 4-digit, non-0000 number to 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 PCM PID: UNLIMITED TRANSPONDER KEY ID is not available, 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 unlimited key mode below.
- Check the PID: UNLIMITED TRANSPONDER KEY ID and compare its value against the code chosen in Step 1.
- Using the diagnostic tool, select PCM from the menu. Follow SECURITY ACCESS to obtain security access. For additional information, refer to ANTI-THEFT SECURITY ACCESS in this article.
- Turn off unlimited key mode to view the security key PID.
- If the Unlimited Transponder Security Key PID is 0000, select Active Command: SET UNLIMITED TRANSPONDER KEY. Enter the 4-digit code chosen by the user.
- Select: ENABLE UNLIMITED KEY MODE.
- Select: IGNITION CODE ERASE.
- Disconnect the diagnostic tool and turn the ignition keys off.
- Program in 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 in this article.
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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.