I had the OS2 code come up a few times after some HARD driving. It has been tested with an electrometer and is in the 500 range. I reset the code everytime and it goes away. (3 times total)

If you reset the codes and they dont come back, does that mean they were just triggered by overuse or exaustive use of the vehicle? My vehicle has 130k but in great condition. They came up one time from regular driving and the other time rev'ed it in the 7 range when the auto stuck.

Opinions or suggestions?

 

They say 3 strikes and your OUT.

Change the o2 sensor, your cars ECU is telling you that the signal from it has gone out of the acceptable range. It might be related to your HARD driving, therefore you can conclude your OLD o2 can no longer work correctly if you push things a bit. That means it's time to change it. They are a ware item......