I'll venture a guess...

Bracket appears to be the holder for the temp sensor harness that would fit behind the bumper area.

Connector would attach sensor to dash wiring harness.

I might be wayyy off on that, but like I said, just a guess...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car