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			Another very real possibility is your clutch interlock switch.  Your clutch must be fully depressed for the vehicle to start.  Many report hearing a kind of "click" when they depress it.  If you are fully depressing the pedal and it isn't starting - perhaps the switch is faulty...
		 
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 '06 Cayenne Turbo S, Beige Metallic/Tan
 
 Ex - '99 Arctic Silver, Red Interior, Silver Top
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