I believe it is a factory alarm.
I looked at several threads, but they each discussed using Forscan to eliminate the double honk when you walk away from an idling vehicle and you have the key fob in your possession. Some had a spreadsheet of dozens of codes, but I didn't see one that dealt...
Just bought a 2013 Expedition. The horn chirps on the first press of the door look button on the remote, and the horn chirps on the first press of the door unlock button on the remote.
I would be OK if the horn chirped on the second press of the button on the remote. I asked the dealer how...
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