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Re: P0641 VREF 1 low
Posted to Technical Theory Forum on 8/6/2018 2 Replies

It says... Do not replace the ECM for this concern unless SI diagnosis leads to ECM replacement because in most cases, it is unlikely that the ECM is causing this concern. The following sensors share the same 5 volt reference: Manifold Absolute Pressure (MAP) ... Login to read more.

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