I have a 93 Buick Regal and have replaced the handle 3 times so far. There's a small panel on the inside of door behind the handle, remove it. Look around the door mechanism and you will see two metal clips, these need to be removed. There's one at the top attached to the hammer arm, there's also another one up closer to the key. Then there's two bolts one at the top of the door and the other is close to the key hole. That should remove the handle.
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You have to get under the car and change it that way.
You can't (not legally, anyway)
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Buick Regal was created in 1973.
As soon as the 2003 Buick Regal change oil light comes on, it is important to do so immediately. Not changing your oil can damage the motor in your car.
Should have access after removing inner door panel