That's not to say Johnny's sensor isn't bad and if it is that heat didn't cause it, but I do know Johnny ran leaded fuel a bunch in that car many times when he worked at the airport and that IS something would greatly affect O2 sensor life.
This could be true, but I don't feel like the sensor would start behaving again after going WOT if it was wearing out. Also, the sensor looks to be in the same shape as the one in the Spyder which has never seen leaded fuel. "Looks" being the key word. haha
My car did exaclty what your saying.. Ran fine and smooth during full throttle.. Then start acting up again when cruising. I drove for a week or so like this untill it started giving me codes. I swapped the sensor, ran much better.
I was told that the mtx gauge/controller may also be the culprit and yes, would run better with a fresh calibrated sensor. After a lot of research tho.. I actually opted to switching widebands for this year. Too many issues with the mtx.
