I am not 100 percent sure. I have it at the dealer so they are looking at it was just hoping to see anyone had something similar. I think it was something like 3357 and the description was high voltage to aux. something like that i would look if I had the boat in my possession.
I have the full DTC list for the Indmar Ford engines. If it is SPN 3057 FMI 3, that is the precut O2 sensor on the Drivers side. That is the O2 sensor in the top of the manifold on the right side of the boat.