Question about 1999 Mercury Grand Marquis
You have to have 2 keys that are already programed in order to program another key. The procedure is cycle 2 programed keys in the ignition switch one at a time pausing 3 secs each time in the run position or until the antitheft light proves out.Then cycle an un-programmed key for 3 secs and the same for any addition key.It will have a limit of 8 keys.
If you do not have 2 already programmed keys then you have to have a scan tool that will perform security access and key programming.
Posted on Mar 10, 2009
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Posted on Jan 02, 2017
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