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			I can't comment on troubleshooting this, however if the horn is bad, I highly recommend installing an air horn.  If you're going to go the trouble of taking the front bumper off, why not.  I have a compact one from Griots, and no longer have an issue when trucks try to cut me off.  Very easy installation.  Good luck fixing it, have you considered that a non-OEM relay may be an issue?
		 
		
		
		
		
		
		
			
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				1999 Ocean Blue Metallic Boxster - blueboxster.com 
			 
		
		
		
		
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