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The ecu does not go into "limp mode" for lacking an o2 sensor. No o2 will cost you about 5mpg. Your CEL won't even come on. Just a stored code.
You will run rich, but probably not enough to cause issues with cylinder lubrication.
You will have a hard time passing emissions however. The 4age 20v can pass without the o2, a 3sge won't.
Running without an o2 is not the end of the world.
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