P0643 Ford - 2009 explorer

Question

I have a check engine light on, car runs fine. Code P0643 appeared upon testing. What is the problem, and how can I fix it?

Answer 1

P0643 Sensor reference Voltage "A" circuit high

This is for the voltage reference circuit shorted to voltage, this can be from a open circuit to a damage sensor, to a disconnected ground.There is a variety of sensor that has to be checked. such as APP (accelerator pedal position) a/c pressure sensor, EGR position sensor, fuel rail pressure sensor,fuel tank pressure sensor, throtttle position sensor (TPS), or PCM. Check the wire to each of the sensor especially the ground.