Originally posted by SoilDoc
No idea about the O2 sensor but I wouldn't think it was covered by warranty because those things tend to go bad, right? However, that's a question for someone smart like Tone.
Actually exhaust parts and O2 sensors are covered the longest out of the vehicle warrenty. Without them you have bad emissions, with bad emissions the green peace folks start freaking out about those darn SUV's robbing the planet

Check your manual, items like 02 sensors are covered for a decent amount of milage