94 should be OBD first generation, codes can be read by shorting pins 1 and 2 together, turning ignition on and counting the flashing CEL.

Is ABS light on?

Is ABS light on?

Could it be the wrong brake pads, and that’s a low lining sensor?

Does the door move up and down? Possibly the hinge pins. If it is, there are 2 ways to repair, replace the worn pin and bushings in the faulty hinge(s) or replace the hinge assembly. Only basing this on the fact thatvthe door is sagging, which is usually the hinge pin(s).