I recently purchased a fully stock 2011 F250 6.7 with 50k miles. After driving the truck then sitting and idling for a while once you drive it again it throws a few codes. It has done this a couple times and I have been doing my research as to what it could be. The codes it throws is P132B (Turbocharger/Supercharger Boost Control A Performance), P0471 (Exhaust Pressure Sensor A Circuit Range/Performance) and P0402 (Exhaust Gas Recirculation (EGR) Flow Excessive Detected). Currently I have removed the exhaust back pressure sensor and it has the normal soot that everyone talks about. I am going to replace the sensor as well as clean out the line for the sensor. This may or may not be the problem but from what I have read it was a good place to start. I am new to the diesel world so please let me know if you have any other suggestions. Thanks in advance.