keyless Entry Remote
 

Having problems With my keyless entry remote..It will not work. I changed the battery and it will still not work..Do they go bad?? Also I just noticed that the ignition key does not unlock the door locks if your remote goes bad..I guess there is another ket to unlock the door??I bought the car used a couple years ago and I did not get another key for the locks...I did get two remotes, so one still works but I'm worried if it goes bad then i have no way of locking or unlocking...Where is the cheapest place to get a remote and does mercedes have to key it??


Thanks..