I have the LS3. The code it kept throwing was P1153. No leaks were found. I was told the code would not cause a problem for me, I just didn't like it showing up randomly. It usually cleared on its own in a day or two. Andy at ADM recommended going back to stock so I did. He said the tolerances were looser on the 2011s, and more so on the 2010s. He said the 2012s he has seen are hit or miss on the sensors.