I found this hanging by the wire harness and sitting on the plastic belly pan/splash shield of our 2008 Quattro. I can't figure out where it fell off of. It has a short 16 inch wire going into the vehicle harness near the passenger side motor mount I think. Don't see any marking, but it kinda hard to see in that small space. Don't see any codes set.

 

The sensor seems to be missing from the driver's side engine mount, looks like this is it.