After having hot start start & stalling problems, the issue was traced to the "Position Sender Unit"

This resembles a small spark plug wire, but is listed as a sensor. I was told it transmits or regulates ignition firing data between the ignition control unit and the engine.

But is it an actual sensor or just a wire?

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black