Originally Posted by
monroe
"... When I go to start the car, it turns over and starts fine, but then immediately dies. When I say immediately, I mean, as soon as I let go of the key..."
"... although the key was in the ignition and turned to the ON position, I didn't have any electric power in the car..."
"... I finally found that if I give the key a very slight nudge toward the start position, that the electric systems then come on. Once the electric is running, I can go ahead and start it up and it then runs fine..."
These are all classic symptoms of a bad ignition switch.
"... my check engine light is still coming on from time to time, which I think may be my other O2 sensor, but I have yet to confirm that..."
Sounds like a separate problem. You'll have to check the code to see what it's trying to tell you.