One problem related to anti-theft controller has been reported for the 2013 Ford Flex. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Ford Flex based on all problems reported for the 2013 Flex.
Driver's door latch ajar sensor malfunctioning. Reads "door ajar" with door closed, have to repeatedly open and close door to get the sensor to read correctly, and it still doesn't work right. Anti-theft alarm will randomly engage because the sensor is telling it the door is opened after being locked.