the car is a 96 dx I'm getting code 17, speed sensor I expected this one.

I also got code 20 electrical load detector, 41 primary oxygen sensor heater,and 65 primary oxygen sensor. its these I'm not sure about I guess I need to replace the primary o2 sensor which one is it and could the electrical load be caused by one of the the malfunctioning sensors or is it something else unrelated?