Lack of Boost or Over Boost Condition Due to Sludge in Turbocharger on Ford E-350 Super Duty

A lack of power and possible Check Engine Light may be experienced with codes P0238, P0299, P0404, P0478, P2262, P2263. The turbocharger can become internally contaminated with sludge and deposits causing the variable vanes within the turbo to seize. The turbocharger can be disassembled to be cleaned, and the internal parts can be replaced as needed. If deterioration is too bad, replacement of the turbocharger may be necessary.