Check engine light came on and local auto parts.

You should replace it as soon as you can. It will cause the engine to run very rich and use more gas. Also, other things can be damaged if it is running rich. They are easy to replace. One wire needs disconnected and then you can screw the sensor out of the exhaust. As far as leaving you stranded, unlikely, but it is possible.

Let me know if you have other questions,

Joe