it isn't sensitive where high pressures will throw a code necessarily, it's sensitive to where uneven pressures can throw a code. and this is just the 1/2 dozen with vss codes that our shop has worked on, i can't speak for all. I'm not saying that if your pressures are off, codes will appear. i am just trying to help people self diagnose their spyders with out having to go through the hassle of bringing it to the shop and be without their spyders for a few days. this is just a few inside pointers from a tech's experience.