This is our vane position sensor kit for lly-lml Duramax engines 2004.5-2015. Failing vane position sensors can cause a ton of issue on a Duramax and are vital to making the truck run properly. These are very high-quality sensors and we have been using these on all of our turbo builds for many years. Please don't buy a cheap sensors, we have seen people do this time and time again and its a nightmare to diagnose and can cause even more issues.