!!
critical Ford
Error Code ANTI-THEFT SYSTEM FLASHES
Antitheft system activation due to unauthorized key use or detection.
? What Causes This
Possible key theft activity, tampering attempts or technical malfunctions indicated by multiple chimes and flashes.
✓ How to Fix It
Disable vehicle as per manual guidelines and contact dealership for immediate inspection. Malfunction not associated with driving should be addressed without delay.
Source: page 17 of the official manual
From the manual
This error code appears in:
Ford F 150 2009 2014 Fuses And Fuse Box Diagram And Location