Recently repaired a running rich condition and my O2's, which are fairly new, were in the car while it was running rich. Scanmaster data shows the O2's to be working fine and no SES light. Could the rich conditon cause the sensors to be coated or out of calibration because of the previous rich conditon ?
The reason I ask is now that the car is running properly should new O2's be installed ?

 

If the O2 sensors have low mileage on them, I wouldn't worry about it.