If it was modified, it will have a permanent P1400 code which invalidates the warranty.
It's a hidden code. It doesn't show up on common OBD2 scanners. However, dealer systems (and professional scan tools) can see the code. It is a blanket code that just says that the engine has been tuned and will stay on the car forever.No codes are displaying on my screen, are you sure about that? factory setting and factory tune are on the car now, if it was a p1400 code they should have told me by now.