So last night i was driving and my CEL came on out of no where. I pulled over at a gas station and checked my car out. Everything seemed to be fine so i assumed it was something like an O2 sensor. I went to Autozone today and sure enough that is what it is. My general ?'s are do i need to fix it right away, could i cause any kind of damage to my car by driving like this for a few weeks till i get paid? also I have access to a lift and are they easy to replace for someone who hasn't done it before?

 

DTC P0137: Secondary HO2S (Sensor 2) Circuit Low Voltage

Its not going to hurt the car the secondary O2 is for emissions more than vehicle well being

As far as being easy to replace, sure as long as it isn't stuck