So as the title said, was getting code 91 with KOER. Replaced O2's, now get code 41. No need to post the test path, already did that. Here is what I found. When the car is cold and i probe the computer pins for the O2 sensors, it starts at 4.xx volts?? Then slowly drops to 0.3-6ish volts after a couple minutes. You can start it, it will start at 4.xx volts, and you can watch it drop. Any ideas?