P0642 Ford -what does sensor "a" low voltage mean?

Question

*how do you repair... Is it the. ECM connection, the ECM, tps????

Answer 1

P0642 Sensor reference voltage A circuit low

Sensor votlage "A" mean the refference voltage is low, This condition can be from a sensor shorted to ground , a improper sensor connection ,or a damage sensor,The sensor that needs to be check are the ETC (electronic throttle control) VREF ,the acclerator pedal position (APP),the A/C pressure transducer,Fuel tank pressure sensor (FTP) , Fuel rail sensor,the MAP (manifold absolute pressure ) sensor,Throttle position sensor (TPS), Check for other code that have appeared, the sensor that has coded with P0642 is more than likely the sensor that is causing P0642