You may very well save yourself alot of time and money if you call a locksmith. -----------------------
Door lock cylinder: http://YouTube.com/watch?v=pl8lo3fqQbQ Ignition lock cylinder: http://youtube.com/watch?v=D3o4IuScZZI
Is should not be that difficult. Pickup a service manual, I believe that the Saturn uses GM's Passlock Anti-theft system. If you are having problems with the ignition or the car starting, it is more than likely thie ignition cylinder lock. This is a common problem with GM vehicles. This also should not be all that difficult to replace. There is a bit more to it than replaceing the ignition cylinder lock you will have to reprogram the system to read the new key unless you have the new lock keyed to match the original key.
To replace lock cylinder in the hatch ,first inside hatch panel must be removed. After removing the panel you will have access to the lock cylinder. Remove the linkage to the cylinder and pull the retaining clip from the cylinder and the lock can be removed from the outside of the latch. This is not a hard job to do , 1 hour max if your slow .
How I can replace ignition switch cylinder from Isuzu Rodeo?.
See related links below
What model?
Replace the lock cylinder
Remove the retaining ring at the top of your Chevy S 10 ignition lock cylinder. Slide the ignition lock cylinder out. Remove the wiring harness from the back of the ignition lock cylinder. Reverse the process to install the new ignition lock cylinder.
Begin by removing the retaining ring at the top of your 1994 Ford ignition lock cylinder. The ignition lock cylinder will slide out. Remove the wiring harness from the end of the ignition lock cylinder. Reverse the process to install your new ignition lock cylinder.
The ignition lock switch is found under the steering column on a 2004 Honda Civic. Remove the steering column and ignition switch. Loosen the mounting screws that hold the cylinder in place. Pull and replace the lock cylinder.
You can replace the ignition lock cylinder in your 1994 Pontiac Firebird without removing the steering will. Remove the retaining ring at the top of the ignition cylinder. The ignition cylinder will slide out.
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Pay someone to do it.