Close the trunk on a passat o6 I cant close it, I dont know if its a sensor

there is a button type sensor (pressed when trunk closes) it should be easy to find (look around the outside edge of the trunk but still under the actual trunk) it can usually just be adjusted but may need replaced.

Replace the electric trunk latch assy

Try ---dealers parts dept first,then salvage yard,
then the internet

Most vehicles have a backup method of opening the boot. Check your owners manual. Normally a cable behind the rear seat if you have fold down rear seats. or button in the glove box.

make sure glovebox trunk lock didn't accidentally get pressed http://youtu.be/JGLQtYSdL1Y

ask a local mechanic to have a look as you have locked it and the only way to open it now is to unbolt the hasp on the car body from the inside ,very difficult job may i add

this always happens to my 06 passat when its really cold, im talking 0 or lower. i try not to open the trunk in the winter if i can help it. Its annoying but in the summer i have no problems. I have herd of alot of other people having this problem, VW knows about it and dosnt think its a recall item for somereason, look for your fancy gas door to not open next, i know of 3 people that started having trunk problems and then the fuel door stopped working, not sure if it has anything to do with it or not. but It happend to me and now i have the auto fuel door disconnected from the inside of the trunk.
The trunk issue isnt anything big to worry about it seems intermittent. I found latches and there a little pricey thats why i just deal with it.

piece of plank type wood and then wack it with a 14lb hammer back into shape

Try a screw driver,and release the trunk release at the same time and unsnap the latch,the latch thinks it is closed,because the latch never opened back up to allow the striker to go in it and trigger the latch to close,the latch is in closed mode,you will have to manually unlatch the latch sort of speak.

There is a electric motor on the lower part of the trunk that usually goes bad. Not on the trunk lid but the trunk part. You can remove the assembly and take it apart so you can turn the latch all the way down , Once youy have done this you can put it back in place. Make sure you unplug the motor so it won't go up again, You should be able to use the release button inside.

possibly the lock is faulty.open the trunk and manually close the lock and see if it holds,if not replace the trunk lock