I am having the same problem, along with some others.
I have not found a permanent solution, but if you look under the steering column directly below where the key is you'll see a little plastic cap. Pop out the cap with a small screw driver, then take a drinking straw and push it into the whole while you tun your key back.
I wish I could find a proper fix for this, but this is what I am doing for now.
Thursday, August 9th, 2007 AT 8:28 AM