Leaking charge air cooler tubes, hoses, or seals from turbo, intercooler or intake; Dirty or Damaged MAF sensor; Other boost leaks and or exhaust leaks (before the turbocharger) Turbo and or VGT system failure- VGT actuator stuck open; EGR valve sticking or other EGR system failure; Plugged air filter; Plugged DPF; DTC P0300 Misfire detected