Code 41 means problems with Oxygen Sensor Heater. I have no knowledge of that.
Code 15 means there's a problem with ignition output. Manual suggest replacing the igniter unit. However, i would try borrowing an igniter unit from someone who has one and doesn't need it for a while. Put it in, use it a few days and see if your error dissappears. If it does, but yourself a new one and return the borrowed one
