delt151 Posted May 30, 2011 Report Share Posted May 30, 2011 This message appears in my display when I first start my car. Check Security System. Quote Link to comment Share on other sites More sharing options...
JeffIsHereToo Posted May 30, 2011 Report Share Posted May 30, 2011 This message appears in my display when I first start my car. Check Security System. I did a google search for: mustang "Check Security System" And found quite a few references. I would start there and then your dealer. Quote Link to comment Share on other sites More sharing options...
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