Can anyone tell me what this is

[DuluthSonic]

Can anyone tell me what the connector circled in red is for? A few days ago I had the radiator coolant temp sensor replaced due to it leaking. Tonight as I was peaking around to make sure it wasn't still leaking (its not) I noticed this was disconnected. Don't know if the shop forgot to plug it back in or maybe it was already disconnected. Been driving with it disconnected for two days and I haven't thrown any codes or had any issues with the car. I did plug it back in. I couldn't get a good shot of it myself so I borrowed this image from the web.

 

[2014 Blue RS]

Look like the air intake sensor that plugs into your front grill

 

[DuluthSonic]

I'll see if I can take a better photo of it. It clipped in between the engine and the radiator.

 

[DuluthSonic]

Here is a closer shot of it circled.

 

[mja]

The first picture looks like the correct location for the a/c refrigerant pressure sensor.

It should have a purple gasket like that, but I don't remember having the gray plastic protector over that female end... another sensor had that plastic over it but can't remember which one.

The second picture, I have no idea. My a/c refrig. pressure sensor off the front harness is different than the 2nd pic.. I think the two pics might be showing 2 different sensor/harness leads.

*When I ordered a harness for my 2012 Sonic there were 2 different harnesses for the same make/model/year/engine combo.

... there is another sensor in that area for the airbag/bumper but mine doesn't come off that harness.