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Putting back a C6 that my buddy owned. On the front passenger side, right on the radiator support. There are 4 plugs. One is for the fog and the other is for the side marker. That leaves two unknown plugs.
The plugs that are hanging don't look like its for the ambient temp sensor however. One may go to the horn, the other for the underhood light, even if it doesn't have one, the plug is still attached near the top of the radiator on passenger side.