Check engine light of my Chrysler Sebring LX Sedan 2004 came on and it's knock sensor malfunction..?

I am planning on going to a beach which will be a 2 hour or 2 and a half hour drive. If my knock sensor malfunctioning caused my check engine light to come on, will it be safe to drive for that long of a time? I don't know a lot about cars but a quick research, I understand knock sensor malfunctioning could lead me to a poor fuel economy, if I could just fill the tank up when it gets low while driving, am I good to go even thought the knock sensor is bad?