How do I remove the flame sensor on an 1988 model gas furnace?

To remove the flame sensor from a 1988 gas furnace, first, turn off the power and gas supply to the furnace for safety. Locate the flame sensor, which is typically a thin metal rod near the burner assembly. Use a wrench or screwdriver to unscrew the mounting bracket or nut holding the sensor in place, then gently pull it out. Be careful not to damage any wiring connected to the sensor.