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Message: <blockquote data-quote="fiveliterdriver" data-source="post: 460299" data-attributes="member: 10742">Well actually o2 sensors def need to be replaced when they go bad. And they do go bad. When your not getting any codes and the car is dumping fuel before opp temp. comes. They can last a long time but 50000 is pretty common. Newer parts are cheaper and not as durable it seems. I have replaced mine so I am not saying they aren't bad. But usually they are telling you there is another problem. No worries, even as a 10 year tech I still have to sort through things dealing with o2 sensors to determine the actual issue.</blockquote>