1998 Porsche Boxster - door lock does not work on the driver's side. The key will actually turn a complete circle and won't catch anything. The key still works on the passenger side, but it still won't lock the drivers side. Seems like something has fallen out of place.

SOURCE: manually openning the trunk of a 2002 porsche boxster

It can only be done using the key fob. Othersise use button inside the car. If your battery is flat you need a donor battery wiring to a connection in the fuse box (positive) anf door lock(negative) but see your hand book.

SOURCE: key lock on drivers door won't unlock the door

you need to take the door panel off, there is a rod in there that connects to the lock cylinder it frequently pops off, there is a little plastic clip that should hold it on to the cylinder it may be broken!!

SOURCE: 1999 porsche boxster cannot lock car with key or

Try replacing the battery in the key. It may be too weak to engage lock.

SOURCE: 1998 Toyota Corolla Electric Door Lock Problem

You'll need to replace the solenoid (motor) that doesn't work. Not hard once you get the door panel off. I suggest you buy the correct part, not a universal one.

SOURCE: porsche boxster 1998 squeaking suspension

I had the same problem on my 2004 Boxster.. It is the outer ball joint.. I filled a Syringe with liquid grease and poked it through the Ball Joint boot to squirt it in.. Problem solved and small hole in the boot not noticable..