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			Yes it's a dual tone, meaning there are actually two separate horns.  Both of them are behind the front bumper over more towards the passenger side.  I don't recall if you can just get to them from underneath by removing the lower, front plastic cover.  I would try that before removing the bumper cover.  You probably have a loose connection on one of the horns. 
 
Kirk
		 
		
		
		
		
		
		
			
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				2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars 
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels 
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody 
1975 911S Targa - undergoing a full restoration and engine rebuild 
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
			 
		
		
		
		
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