I will make a brief fairly simple explanation in my upcoming video. For a really comprehensive explanation of fuel trims (as well as other technical stuff) I highly recommend the YouTube channel Schrodingers Box: 
https://www.youtube.com/watch?v=5WnM_NsOtd8&t=677s
		 
		
		
		
		
		
		
			
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				James now has: 2008 987S 6 speed 
Crashed: 2010 987.2 pdk in speed yellow!   
Sold to a cool racer chick: 2004 986 S 
YouTube channel: the PORSCHE as seen by NewArt
 www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
			 
		
		
		
		
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