P0651 – Sensor Reference Voltage “B” Circuit Open | CodeMechanic

Hey everyone and welcome back to Code Mechanic! This video dives into the critical concept of sensor reference voltage, particularly the essential "5 volts" signal from your car's PCM. We'll explore how to perform "automotive electrical diagnosis" by using a "multimeter" to check this voltage, addressing common issues like damaged wires. Understanding how these "car sensors" receive power is key to effective "engine management" and troubleshooting.