I have a 2003 ZX 5, yesterday the ignition key refused to turn. I was "/%U?(?% happy.
The dealer where I bought the car told me to hit the key (tap on it),sometimes it replace every OK.
This morning, I ask the desler to remove the tumbler in the cylinder lock. The car start OK now, and it will not jam anymore.
The only thing is that the key can be removed in any position.
Pinetci