I opened our trunk the other day and found this part in it. Anyone have any idea what it is?

 

It's a trunk lid actuator. Have a look at this fairly similar thread:
https://www.jaguarforums.com/forum/x...ry-part-77636/

 

It is a trunk popper. When you hit the trunk unlock button on your key fob, this is what pops the trunk up slightly so it doesn't re-latch. If you open the trunk/boot, on the hinge, you will find a hole in the middle of the hinge that this thing attaches too. Do you need it, no (I lost mine a long time ago). But, it does make getting into the trunk/boot easier.

 

Ah hah! Maybe my car is missing this? When I pop the trunk with the key fob it always relatches!

Edit: my poppers are in there. Maybe they're just getting soft with age ;-)

 

One of mine was broken loose when we bought the Jag the other came off later on. But I've never had a problem when opening the boot. It never re-latches until I close it.

 

One of those was broken off and rolling around in my trunk, too. I hadn't realized that there were two, thought one broke and the PO had it replaced.

 

The dealer calls them "trunk plungers." There should be two, one one each hinge of the trunk lid.

My passenger side plunger just cracked. $16 at the dealer to buy replacement part. Refreshingly inexpensive. Takes 10 seconds to pop the new part into place.

- Ryan