The spark plugs have nothing to do with the horn. First check the fuse, if thats ok, then find the horn and see if the wires are disconnected, if so , reconnect. if still not working, get a test lamp and check for power to the horn. if you have power but it still does not work then it could be the earth to the horn, clean the earth contacts, if still no good then change the horn. If you dont have power to the horn , then you need to check the switch, at this point if you have no mechanical knowledge , i suggest you take the car to an auto electrician.
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