Thanks; that's what makes the most logical sense, but I couldn't find an opening on the underside of the reservoir where this sensor should twist into. I even tried using a mirror. I guess I didn't look hard enough. I'll look some more. Just wanted to confirm that it doesn't go to something else that I accidentally knocked loose while struggling with the connector.

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2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT