Originally Posted by Dave G
The oxygen sensor is listed as an item that must be covered for at least 24-months/24,000 miles. It doesn't seem to be part of the required longer emissions warranty.
Could it be that manufacturers know that this part is prone to failure within a short period of time, compared to other components of the emissions? Does anyone know why the O2 sensor fails? Is it the gas, poor air filter, climate, or just because it is an expensive part that is hard to replace, aka who the halibut knows.