We would recommend checking with a smog check station to make sure the light which is illuminated is in fact the check engine or service engine soon light. It seems odd that a removed horn fuse would cause the service engine soon light to illuminate. The two possibilities are that the light which is on is not the service engine soon light, and will not cause a smog check failure, and the second possibility is that the fuse which controls the horn also is responsibly for an emission related component which is causing the service engine soon light to turn on; which will cause a smog check failure. Visit a local smog check station for a quick answer.
posted by SmogTips Support