port

When looking for the port to install my brake control harness, I came across another port on the left hand side of the driver's side. It was behind where the 3 button panel is (liftgate, tow, park assist). I do not have the park assist on my 2016 explorer xlt. Pic of the grey port below and a...

what is that? it is connected to the throttle some how , so what does it do?! and what is evap service port ? and what it is used for? thank you for your time... http://postimage.org/image/bk7eepox3/ http://postimage.org/image/4j7ovrfhh/ http://postimage.org/image/9yptxxmmj/