Hey Melissa==The ignition switch is mounted on the top of the steering column, under the dash about 18 inches from the floor. Just remove the 2 screws that hold it on and pull it off. GoodluckJoe
There are 2 parts to the ignition switch...The cylinder with the key and the electrical ignition switch mounted on the top of the steering column as Joe (first answer)pointed out. The 2 components are connected by a steel rod.
However the ignition switch on the top of the steering column is a bit trickier to change than Joe noted. To get access you will need to drop the Steering column down.You will need to pull the dimmer switch first to get to the ignition switch. There is a rod the actuates the dimmer switch. You must be careful to get it back in correctly. Also you will need to adjust the ignition switch as it is slotted. As is the dimmer switch...it is also adjustable and you will need to get it adjusted correctly.
Also be extremely cautious if you have a column shift there will be a clip for the PRNDL needle in your dash that will break if you dont disconnect it first. Make sure you mark its position first.
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http://www.automotivehelper.com/topic1054152.htm or Goole "ignition switch replacement 2001 regal"
in the middle