o2 sensor

My bran new 2015 xp 1k threw and O2 sensor code, which I cleared and it immediately re-threw. I took it into the dealership to have them fix it but after a week (how long could it take to change an o2 sensor???) I called them and they told me new O2 sensors were on back order (wish they would have said this when i called them and told them my O2 sensor was throwing a code…)

Anyone know a place that has these in stock? Would gladly pay ~100$ to get my rzr back up and running and then throw the faulty one back on when the dealership has one in stock so i have a spare.

Any idea how long the wait will be for a new O2 sensor?

Any risk with driving with a defective O2 sensor, just worse gas mileage right?