2004 Grand Marquis key
10

Asked by Leonard Sep 29, 2018 at 02:16 PM about the 2004 Mercury Grand Marquis GS

Question type: Maintenance & Repair

Everything I have seen say that you need 2 working keys to program a new key. Can one of them be the valet key?

2 Answers
10

Leonard answered 6 years ago

http://www.programautokeys.com/classified/2004-mercury-grand-marquis-chip-key-transponder-programming-instructions-listing-8042.aspx

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10

Leonard answered 6 years ago

Can I program a third key myself if I have two working keys? Yes, once you have had the new key cut by a Locksmith use the following instructions. 1. Insert an existing working key into the ignition cylinder. 2. Turn the ignition cylinder to ON (RUN) and back to OFF. 3. Remove the existing working key and, within five seconds, insert a second working key and turn it to ON (RUN) then back OFF. 4. Remove second working key and insert the new key before ten seconds have elapsed and turn it to ON (RUN). Leave it on for one second and turn back to OFF. 5. The security light will light up for three seconds to indicate that the new key has been successfully programmed.

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