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Message: <blockquote data-quote="fiveliterdriver" data-source="post: 459307" data-attributes="member: 10742">just because you have o2 codes doesn't mean your o2 sensors need to be replaced. Lets get that clear. o2 sensors monitor the exhaust gases to create the correct fuel curve for the current situation. They tell you how your engine is running. If you have a fuel dumping problem and get an o2 sensor code you can replace your o2's all you want. Its not going to necessarily fix the problem. It just depends on if they are commanding the right fuel curve for the current situation. In this case they are telling you that you exhaust is not correct for the parameters of a tuned up mustang. Clean that MAF, purge the codes and see what happens. The majority of those codes are probably related to that. Let us know what you find.</blockquote>