Not sure to be honest - but as it says Intrusion I googled Sens Assy Intrusion and it appears it’s part of the alarm system.
At a guess its the interior microwave sensor?
I could be very wrong though :-/
I agree.
Hm… but the place is weird. I saw some pictures of others NC and there was nothing in this place but I guess all of MK3 have alarm as a standard…
BTW: I removed all plastics - now it is reeeeeaaaalllly loud inside
On the lable - Fujitsu Ten Limited FTL 186. Google search identifies it as “Automotive Security Field Disturbance Sensor”. Does that help?