If the oxygen sensor fails car will still run, however will run inefficiently and cause increased fuel usage as well as exhaust emissions. The unheated versions usually last about 50,000 miles along with the heated about 100,000 gas mileage. Soot build up will be the main involving failure a great oxygen alarm. Because of this, the main second sensor does not last as long as the first one. This is mostly because of wear and dirt some other parts belonging to the engine. If you want to get sta...