One problem related to horn assembly has been reported for the 2004 Buick Regal. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Buick Regal based on all problems reported for the 2004 Regal.
Comments: safety issue: in an emergency situation where I need my horn to sound, I have difficulty finding the "right" spot on my steering wheel to sound the horn, as the wheel may not be straight at that time, but turned right or left. Also, I may be more concerned to see the traffic situation and cannot safely look down for the horn symbol. On older cars before air bags, that was not a problem. I placed a small sticker over the horn symbols on my two cars. Now, at a glance, I can see exactly where to press the steering wheel for the horn to sound, no matter what position the wheel is in. For night use, maybe a sticker with more "feel" capability, or a sticker that will slightly illuminate. From NHTSA web site.