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If a car uses pretty much a full tank of gas in 4 hours? and if it matters the speed traveling, then is it bad if its slow? is it bad if its fast? thanks

I am about to buy a car where the O2 sensor is broken. I want to know if the o2 sensor is so insignificant that you wouldnt need to replace it? Like what would happen if you didnt replace it? anything drastic? if you dont replace it will it cause any problems? Will a light stay on in the...