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International Automotive Technicians Network
Re: P0641 VREF 1 low
Posted to Technical Theory Forum on 8/1/2018

The P0641 can be set in two different ways, either in the PCM, or in the FPCM. If not in the FPCM, without the corresponding code P069E, then it has nothing to do with the fuel rail pressure sensor issue... Login to read more.