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I attached a pix of the front of the engine, with the yellow arrow pointing to the the plug. It's not a pix of your engine but close enough.
On mine it was much easier to access from the bottom, by removing the plastic cover under the engine, which I had off while changing the oil.
It gives an error code that it's unplugged, but no check eng light or anything to worry about.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
