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Hopefully, someone can answer your question directly.
When I had alarm system problems, it seemed the key would not work properly. Sometimes it would work and other times the horn would beep twice. So I replaced both key heads, but that did not fix the problem. As it turned out, a passenger door micro-sensor was failing and the central locking system thought sometimes that the door was out of synch with other signals.
Do you get a double beep or does the horn blair like someone is breaking into the car? If its the latter, try the double trick and see if the problem stops. If it does, the issue is likely a sensor gone bad rather than a broken key
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