Subaru Problems? Ask a Mechanic for Answers ASAP
You will most likely need to replace the door latch and lock actuator assembly.
Here is the procedure for removal.
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ASE Master Technician
Probably going to have to take the door panel off while the door is closed. You may need to unbolt the drivers seat and move it into the back seat. If you can get the window down all the way, there are lock out tools that can be used to open the door.