What is this?
 

So I was driving along slowly and my car started making a horrible noise then something dropped off and the noise went but I'm not sure what this part is, can anyone help?https://cimg9.ibsrv.net/gimg/www.s2k...b58d873b88.jpg

Half shaft bolts, do not drive car...:argh:
edit:
Ok OK !! Propshaft flange bolts :melodramatic:
:rolleyes:

I drove about 100m and could tell it was something to do with the drive. It's parked up now. How do they just fall off!?

Was not tightened up on install,
you need to check all others also.

Or prop

Both front and rear use collars

Get it up on stands, you'll spot the issue straigh away. I did this on mine when I didn't torque up the gearbox end when I swapped the diff

​​​​​​:D

Definitely prop shaft bolts, do not drive the car until sorted

Did you have any work done recently on the gearbox, clutch, diff or CV joints?

Defo Prop, very surprised you hadn't had a vibration or knocking for a while

Big spinny thing in under the car :)
https://www.hondapartsnow.com/diagra...ft-3063712.png

Do they require loctite? Other driveshaft bolts do... And proper torque.