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Now I have to go get an OBD-II scanner so I can pull the code. I figure the cost of the scanner is on a par with what the dealer would charge me to pull the code.
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Dude, just go to Autozone, they'll be happy to do it for free. As for Grille Blocks, look for where the air intake is, and block it off there. It may seem like a bad Idea, but it's wintertime right now, and all it will do is block off the cool air from entering the intake. The intake doesn't even suck air in from the grille anyway, it usually looks like it, but it actually "curls" around at the end and sucks air either from the side, or the rear, or a combo of both. so it will just suck in warm air from the engine bay, warming the engine faster in the winter. In the summer, or while hauling, I'd remove it.
Did you try any mods before that light came on?