Mr.Saturn

Over the last few weeks, I've been getting a recurring CEL that is reporting code 63 when in diagnostic mode. Car is an '01 and I'm currently running a 70mm Invidia test pipe with both the built-in CEL fix and two anti-fouler extensions on the O2 sensor. This happened on the original exhaust as well as the Challenge 3" I installed. After checking the codes each time to make sure it is still only showing 63, I reset the ECU by pulling the 7.5A backup fuse for 5 minutes or so. Each time, it appears to be occurring during a light cruise.

Anyone have any tips to keep this from popping up so often? I suppose the sensor could be going bad, but I'd really hate to replace it and find out it was fine. Is it overkill to be running two anti-foulers on top of the Invidia built-in fix?