Truck threw codes for exhaust back pressure sensor malfunction.Pulled the sensor and the tube and there was about 2" of blockage in them.Cleared out by hand with a drill bit.Reassembled and drove it-massive amounts of black smoke-it never smoked like that before.Drove around for a bit and tried to get on it a little-heard a loud pop-now the boost gauge doesn't work.After another 5 minutes it shut down again.Threw a code for exhaust back pressure valve.Do I need to pull the turbo to get to this?What exactly needs to be cleaned?I'm hoping this is finally the problem after all this BS.Thanks.