I have a 2003 Volvo S40. The sunroof opens fine in both directions (sliding and tilt) but when I go to close it the sunroof stops about a cm too low. To fix this I can manually play start-stop with the buttons until it lines up just right. Is there something I can adjust to fix this?

 

Caveot - I've not tried this, but found this write up in another thread:

To adjust the glass panel the easiest way to do it is as follows:
Put glass in vent / tilt position.
Remove the side covers (black shields) by pulling straight back. They are a snap fit over a pin.
With the covers removed you can see two screws on both sides. Screws are Torx T25. Torque is 5 Nm. One in front and one 2/3 to the back.
Close the glass panel by holding pushing the switch and adjust the glass panel. There is a minor adjustment fore aft. Try to push the glass slightly forward. Be careful not to push too far foreward otherwise it will leak in the back. This adjustment is done with the front screw only. So you have to adjust fore aft and up down in the front at the same time. The fore aft adjustment will help in the thumping noise when the glass panel goes through the opening. Now adjust the rear. The glass should be slightly under flush in the front and slightly over flush in the rear (measured at the top of the seal).
Cycle and if you are satisfied put the side covers back and you are done.