Can not lock trunk with vallet key-Mercedes 2005 e320

Your car may have had a new ignition switch installed - hence the different key. The FOB may not be programmed properly to lock / unlock. Have you contacted a MB dealer?

You may be able to unlock the trunk from the door lock pump under the back seat. Remove the rear seat bottom and the insulation from the right side. You'll see the battery and a foam box. The door lock pump (PSE) is in the foam box. You need to remove the vacuum line for the trunk latch (labeled RTR or RHR on the PSE pump) and apply some air pressure to it to unlock the trunk. You should then be able to open the trunk normally, unless the trunk lock key tumbler is in the lock position, then you need a key to get in.

With most cars that use keys, the key must be turned to unlock the shifter and steering column.

Many People don't know exactly how to use the manual key attached to your remote to open the doors and trunk in case the battery is dead. All you have to do is slide the locking button in the back of your remote and pull the metal pre-cut key, then insert it in the trunk lock, turn key to the left and then push in. kawaboongha!!!

Just beneath the latch ,you can see a clip,turn it up and close the trunk.Try opening it with the button near dash or remote.It should work.They designed it to avoid theft during vallet parking.The main key(steel one) is used only for ignition.There is another key(with a black rubber head) is for ignition and trunk.So if you want to avoid missing any items from trunk using vallet parking,use the main key,put the clip down and hand that to the person who is assisting you during vallet parking.

Try it both ways and check , but do not apply too much pressure

The mechanism might be siezed. Try lubricating the lock or heating it up to release it.

Valet key is not supposed to operate the truck or glove box lock.

Had the same problem and had to cut a hole in behind the rear centre arm rest to retrieve both sets of keys. I cleaned up the area and made it into a ski hatch or for passing fishing rods thro. MERKYS320

lift the wiper arm all the way up and out from the windshiled. hold the arm so it doesnt slam back down and crack the glass. rotate/spin the whole wiper blade 90 degrees, counter clockwise, and then pull the blade straight back off the wiper arm. install the new one in the opposite order