I've seen posts where folks discovered their CEL bulb was missing.  Seriously!  Appeared the previous owner would remove it to hide the fact that the CEL was on.  Yeah, I know, shady.  If I remember right, a missing bulb produces a DTC.  I wonder if a burned out bulb will also produce a DTC?  You should check for codes to be sure.  
 
Also, many threads on this forum about the horn honking over bumps.  Can't remember the exact nature of the problem, but remember a few o-rings fixed the problem.  Or even a replacement of the airbag or steering wheel mount, I think?  I really can't recall right now.  Give the ole' search function a try and you'll find your answers.