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			Dealers will often tell you that you need new O2's when you get a CEL.  Mine said I needed all four at $1200.  They were wrong.  It was a bad MAF.  I fixed it myself.  6000 miles later and no more CEL... car runs like new.   
 
What error codes did they get?
		 
		
		
		
		
		
		
			
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				2009 Cayman 2.9L PDK (with a few tweaks) 
PCA-GPX Chief Driving Instructor-Ret.
			 
		
		
		
		
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