Originally Posted by
stratoblaster
2012 Mercury 225 ProXS, S/N 1B863738 on a 2012 Z119 Ranger. I have a Mercury SmartCraft System Monitor on my boat (the square one) and the coolant temperature does not show up on the display when I scroll through the modes. When I power on the first thing that pops up is 3.04 STNL. That error code is not in the operation Manual. Also the trim mode comes up but does not show the trim position (I have a separate trim gage that works). The hours used, gal/h , oil psi (symbol only), volts, rpm and water pressure display correctly. If I do a Master Reset will I lose the engine accumulated engine hours? Do you think this will fix the eng. temp? It has never worked since I purchased the boat in 2013. I have read so much about cold starts that I really want to see engine temp.
Bill