You mean I could have replaced my coolant level sensor for only $21? I thought they were like $40! Well, still - my "fix" cost nothing, and at least kept the light off.
Code 41 should be the cam sensor circuit. Either the pickup or the magnet. Sometimes the connection. The cam sensor pickup is a really easy change. It is located in a place you cannot see, but is nonetheless, not difficult to change out. Get a mechanic'* mirror and a flashlight. Shine the light on the mirror and look for the sensor at about 7:00 O'Clock under the water pump pulley (see pic below) After removing the electrical connector and removing one 10mm-head bolt, wiggle and pull straight out on the sensor. Now, turn the engine over by hand and use the mirror to look for the interrupter magnet. If you find a complete magnet in the cam gear, install a new pickup. If you find a hole or a broken magnet or a broken piece of plastic, you will need to install a new magnet. I prefer to do the magnets from the inside by removing the timing cover, but then, I have an air impact wrench for the HB bolt and an HB puller, and the right size 6mm bolts, and have done this more than a couple times. Still, I like the idea of locating the missing bits of metal from magnets awol. Chilton'* 28200 should do you OK for r&r of the timing cover if you choose to go that route.