P0191 Fuel Rail Pressure Range Performance Ford Powerstroke 6.0: Diagnosis and What Actually Fails
P0191 on a Ford 6.0L Powerstroke diesel means the PCM has detected that actual fuel rail pressure does not match the expected pressure: fluctuating outside the acceptable range relative to engine demand: and on the 6.0L specifically, this code has a distinct set of causes that differ from other diesel platforms because the 6.0L uses […]