With my 2001 and ~140k miles I had the same problem with the seat not going all the way forward. Underneath was clear and looked several times as nothing was obviously causing the problem.
Found the "Slide Bar", (which is below seat level on the Right side of the drivers seat adjacent to the console and out of sight), had a 'ding ' on the top of the plastic covering and when the drivers seat belt strap (console side) tried to move with the seat it would bind and cause the seat motor to stop as if the seat was all the way forward.
By lifting on the drivers right seat belt strap and pushing it along the Slide Bar from behind while my son operated the seat control was able to get the get the seat to go all the way forward
Used a screw driver and pump pliers to "squish" the plastic covering back into shape to remove the "ding"..
Seat adjustment went from "just close enough to reach the pedals" to "about got shoved through the Steering Wheel".
Nice thing about this fix is the seat was not removed as the "ding" was accessible when the seat was all the way forward...so far this temp fix has worked but expect to have replace that Slide Bar someday in the future.