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

Hi Tim

I like your thinking to swap the 5v ref supply.

Just on my fast look at the diagram

They both 5v 1, 5v 2, seem to share a ground and also the app sensor uses both 5v ref supply.

joe Login to read more.