Hello and thank you for asking your question on just answer. The adblue level sensor sits on top of the DEF tank and monitors the level of DEF in the tank. The code is for a circuit problem in the sensor which was detected by the PCM. The sensor also contains a heating element to prevent freezing of the DEF in colder climates. You can go ahead and drive it, but should replace the sensor as soon as you can. Can you replace it yourself? Well if you have the tools and facility to drop the DEF tank, then it is pretty easy to replace. If you do not have the tools or a good facility to do this, then it is best to let the dealer take care of this. Like I said, you can still drive it and will not damage anything, but the check engine light will stay on until this sensor assembly is replaced.
I hope this information helps, and let me know if you need further assistance with this.