HELP:  O2 Sensors - part #
			 
			 
			
		
		
		
			Hey guys, I am looking to replace the O2 sensors on my 2001 S but I need some help figuring out how many sensors I need to buy.  Part numbers, how many sensors are there and location of them.  Some items I read say Left and Right Downstream sensors (2) and another left and right Upsteam sensors (2)...total 4 ?   Do I need to replace all 4 sensors if I get code P1130 or more likely just one side ? 
 
Thanks 
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				DrCactus
			 
		
		
		
		
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