truck failed to start anti-theft flashes 11?

1999 FORD F-150
195,000 MILES • 4.3L • 6 CYL • 2WD • MANUAL
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GEORGE ANTHONY
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  • 1 POST
i was having a misfire changed out the coil pack then truck went downhill, lost power, running too rich, then completely stopped starting, scanner read bad coil B, so i reverted back to the old one, the truck started up again, while it was running the battery cable terminal looked loses so i turned the truck off tighten the battery. the truck failed to start anti-theft flashes 11, but goes out after a bit, also my scanner does not pull up any codes.
Oct 9, 2023 at 11:11 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,238 POSTS
A flash pattern of "11" on some Ford vehicles can indicate a problem with the PATS system where it's not reading the key, or the key is not properly programmed. I would do a hard system reboot, here is how:

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

This should reset the system, please let me know what happens.
Oct 10, 2023 at 2:44 AM
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