zapłon Englisch:

I've left the key in the ignition.

ignition key

Doug put the keys in the ignition of his car, but he didn't turn it on.

You need to turn on the ignition to start the car.

I turn off the ignition, and get out of the car. I turned the key in the ignition to find my car would not start.

Switch/Turn the ignition on.; an ignition key