P013A code started to appear and disappear. I plugged in my sct and it read as “02 Sensor Slow Response – Rich to Lean Bank 1 Sensor 2”. I have only used e85 like twice for a couple of races and have been running 93oct almost all the time. I have heard that the issue is with the placement of the 02 sensors on the headers. Has anyone else had any issues similar to mine with these headers? On another note where is the location of the 02 sensor that is going bad (Bank1sensor2)??