My check enigne light went on the other day, so when I ran the code it came up as the primary o2 sensor Heater, so my question is does anyone know if I have to buy a new one or can I just replace the heater in the o2 sensor?
Just wanted to know because that is really expensive.

 

The O2 sensor heater is an integral part of the sensor. You can't get it separately.

 

I'd check the wires for continuity first and then resistance. The wires might have become dislodged. If you have continuity, check the heater resistance. Maybe it did burn out.