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					Originally Posted by Lobo1186
					
				 
				how did you figure out about the cracked oil filler tube.    
			
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I ran out of personal time to troubleshoot it, so I took it to a reputable indie shop.  They suspected the leak, so they used their smoke generator to find the crack in the bellows.  They installed a new oil filler bellows, and no more CEL.
That cost me about what I paid for the O2 sensors I didn't need, and am now holding.