omega3083

I did own a 2009 Flex that had the same problem. It did not register any problems in the system . The problem would come and go without any pattern . I discovered on Ford Flex.net that other owners had this problem ,and after the dealer replaced the starter relay ; .the problem was solved . It fixed my problem,and it never came back. Since the flex is a sister to the MKT ,this might also be your solution.

See below