Having problems with your 2004 Mercury Grand Marquis ?

The security code is not work however I am sure its corrert and I can not make a new spare key for my car.

Posted / edited by AnonymousUser on : 15-01-2018

Answers :

Check the wires connections and module. Visit autozone.com for free access to this ifnormation in the wirinr diagrams section.

Good luck.
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