so i Searched and found good information.. But Im just not understanding any of it.. So i turned to my last resort and actually posted.. P0138 and P0139 are the codes Im getting.. Bank 1 sensor 2


The one i need to replace in the one on the rear of the y-pipe correct?
or is it the one after the cat? If its the one after the cat then i'll just get a o2 simulator..

Sorry for the asking something thats been covered time and time again.. Just didnt want to replace something thats not broke.

 

Ok.. Im going with the one after the cat.. nevermind