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There are several codes for specific problems with the oxygen sensor (this is in addition to the suggestions on the other reply). If your car is a 1995 you can use the built-in reader to reveal which ones. Details about reading codes and a list of them can be found on volvospeed.com Bay13.
One code for the oxygen sensor is for slow response - I got this repeatedly. It returned each time a couple of weeks or months after clearing the code. Replacing the oxygen sensor cured it. There were no performance symptoms.
A small vacuum leak can also trigger a persistently returning code, again without obvious symptoms.
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