Just bought this car I can't open the trunk with ignition key

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?

I'm guessing you bought the car used this happened to me and it was because the trunk had been replaced from a wreck and thus ended up being keyed different A locksmith can make you a new key otherwise its a pain Cuz if the battery goes dead you can't open it

not sure about the door... but a valet key is just that. it should allow a 'valet', person other than you, to drive your car without having access to any storage areas. therefore you can lock valuables in the trunk. the system should also disable any electronic trunk switches with that key in the ignition.

Hello. The electronic opener needs new battery. Change it and it will open. The dealer can get you a new key. Get the Vehicle Identification Number & Bill of sale or good proof it is your car and they will help you get a key.

If the key works in the ignition, but not the doors; chances are they've replaced the ignition, without reconfiguring it to that key. Or at one point they replaced all the locks on the doors and trunk.
It's not a key programming issue. If it were, the doors may work but the ignition wouldn't.
So, it looks as though you'll need to call a locksmith to rekey your doors and trunk.

Good luck!


Alex

How can a lock not lock or unlock with a physical key? Maybe the cylinders are frozen? Try squirting a little oil into the locks.
1996 Town Cars have keys and keyless entry. The physical keys are two, an ignition key and a door key. You can't use the door key in the ignition, nor the ignition key in the door. They aren't interchangeable.
The default key code for keyless entry is posted on the right trunk hinge, inside the trunk.

you should have trunk key all cars trunk can be open remote by the inside. if any fails you always have a trunk key. check your ignition key .i seen ignition keys do both. it cranks car and open doors and trunk.

you have to stick the key in the trunk and unlock the trunk to get the gas door open!

jump start the car or charge the battery from under the bonnet(hood) ,look for a plastic cover on the firewall with a big + on it negative is the engine

I would have the ignition itself replaced. These go out all the time and will leave you stranded. Get a new ignition keyed to your current key and you won't have to do programming. A locksmith can do this for you. Do it soon though before it stops turning.