I am purchasing a used 1998 subaru impreza coupe with a manual 5spd transmission with 150,000 miles. Are there any common problems with that year and that mileage that I should check for before purchasing the vehicle so that I dont have to make any expensive repairs in the near future.

SOURCE: 98 subaru impreza knock sensor

at the top of the block under the plenum runners.
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cheers

SOURCE: subaru impreza automatic transmission won t shift

Try replacing the transmission filter and the trannie fluid. Mine would only go in reverse, and now it drives pretty well. This year has a screw on filter. Hope this helps

SOURCE: 98 subaru impreza 5spd transmission bearing noise

Sure sounds like a throw out bearing having too much room. Might need adjustment.

SOURCE: Help removing interior door panel/ 1996 Subaru Impreza Coupe

First you remove the small triangular shaped plastic piece that is on top of the door panel by the front of the door by the mirror by simply prying it of. Next behind the door open lever if there is a small plastic cover remove it under it will be a screw. Next your window switch will just pry up and out, disconnect the wiring, under the switch there will be a screw ataching the door panel to the door. Next on the face of the door panel if there is a small cover about the size of a nickle but elongated, remove the cover and remove the screw below it. Next pry the door panel from the bottom untill it "pops" out and grab it and pop the rest of the panel out, lift the panel up off of the window ledge.

SOURCE: 98 subaru impreza 5spd transmission bearing noise

sounds like u need a clutch fork