Trunk wont shut? I have to slam it couple times.. (02 CLK 430)

Seriously, it sounds a lot like the issue I had - except mine would not latch at all (you could walk up and with only *slight* resistance and lift the trunklid).
I pulled my latch apart, removed the key cylinder and found a tiny piece of metal (looked like a rivet) had popped off. I have a replacement (used) one on the way I found on Ebay for $55. If you find out that's the problem with yours, be prepared since most of them run $200 because they come with the lock cylinder.
See my thread here: https://mbworld.org/forums/clk-class...-not-lock.html
Also, if you'd rather replace it I have the 'wrong' latch for my car that might work on yours...



