Powerstroke 6.7L Wastegate Solenoid Noise
After 103K miles my 2011 F-450 Dually developed a strange noise approximately 30 seconds after the motor is shut down. A loud buzzing noise starts that cad be heard from 20' away. It lasts approximate...
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After engine shutdown, apply the brake. I had the TSB mentioned above done and the problem is fixed.
