Mine got replaced recently and a warranty claim was made that covered the cost. As far as remapping with the pcIII the answer is yes, it has to be done. As a matter of fact I probably wouldn't take it to the dealer with a driveability complaint hoping to get the injectors replaced with a pcIII on it. You are just giving them the ability to place the blame on something other than the injectors. When I took mine in I had the factory air cleaner and exhaust on it. They looked at it, ordered the parts and replaced them a week later when they came in.