Two problems related to horn assembly have been reported for the 2004 Ford Focus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford Focus based on all problems reported for the 2004 Focus.
I own a 2004 Ford Focus zts, purchased new in June, 2004. Since purchase, I have had the horn replaced twice,meaning the car has it's 3rd horn. The problem appears to be water entry into the horn itself, possibly shorting out the device. The water could be from a car wash, or from water entry while driving in rain. This is a safety defect, in that I have no idea whether the horn works or not until I attempt to use it. This could be a major issue if I need to warn someone of my presence.
My horn stop working a little after I got the car back in 04. Ford has put about 5 new horns in still nothing. It works for a bit, then out of no were it stops. Then around 34,000 mi my car was in the shop for 33 days. At the time no one told me that my car was a lemon if its in the shop for that long under 36,000 mi then its a lemon. Then at 58,000 my engine starts to make a noise. So I take it to Ford, yep it needs a new engine, so they put a new one in there. Well at 67,00 guess what, my ignition has locked up, so now I'm screwed. I can barley make my payments and now I can't even drive my car. . . . . Again.