I changed the plug together with the conductor plate so this cannot be it.
Back in January 2015 Jessejamesrt6 had a similar problem and he replaced the same parts, he still had the code and the limp mode, it was determined that whoever was clearing the code was not doing a good job of it. A visit to another shop with a better computer to clear the code resulted in no code and no limp mode.
For what it’s worth that is what I found.