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			I recently had my aos replaced on porsche Dealer. I had these symptoms: 
 
1) White smoke on startup (cold and warm)  
2) When idle, the engine was reving by itself 
3) Engine light went on ( but porsche said it was just because of the smoke ) 
 
As others mentioned, maybe an aftermarket Aos did fail ?
		 
		
		
		
		
		
		
		
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