Last week my CEL cam on, it was a Saturday. Then it went off. Now it's back on with the code P0450 - 02 sensor. Is there any way to easily re-set the light? Any suggestions would be greatly appreciated. Thanks in advance

 

This is a 2008 997.1 with 14,000 miles

 

Are you sure it is O2 sensor related? My quick search points to the gas cap. Did it happen after refueling and driving sometime after that? A code reader can reset it.