The sensor in the outlet is the engine coolant sensor. It set a code when you refilled the coolant. I remember this happening when I did the water outlet.. Bleed the air out of the radiator tank on the white screw on the passenger side radiator tank.Unfortunately, I do not have that ability. I also can't seem to find anyone else who has experienced this issue. I may have to suck it up and pay the dealership pricing. (Insert stomach churning noise here). Ugh
Reset the codes..