1997 S600 Coupe Brabus Mono 3, 2001 Lexus LS430, 1991 300SE (mom's car)
I have a 1991 300se (w126). The door locks had been working perfectly until last night when I tried to open the rear door from the inside while it was locked. Now, only the drivers door can open via key (usually they pop up or down with the turn of the key now only the drivers door does). The rest I have to manually lock and unlock (which is very hard to do). I know that probably makes it even worse. Where do I start? What can I do? Is there a way to reset the system? What could something like this end up costing?