Replace the tumbler assembly, it is broken.
The ignition tumbler will not turn and you will not be able to start the car.
if its cranking but not starting most likely fuel pump
battery is shot?
Could be a bad ignition switch
Try "Mechanical Engineering" and then start moving forward.
it could be something wrong with the ignition switch, and or alarm
check ignition module.
try replacing the ignition coil
whats wrong with it?
looking forward to talking to you or speaking with you.
Check the ignition switch itself, sounds like it may be the problem.
If you have a chip in your key the chip may have gone bad or your ignition is not reading it. the car thinks someone is trying to steal it & stops ignition process
first thing you need to do is check to see if you have spark if you know for sure that you have 45psi for fuel pressure,then likely cause is you need an ignition module
It could be that your ignition key has the wrong security code.
Might have a bad ignition control module or ignition coil. Good Luck!!
your battery may be dead or try unhooking your battery for 1 hour then hook back up and try again
The security system has activated. Wait 30 minutes and try it again with the right key.
ingnition switch locks up on 2003 Ford Mustang and only way car will start is if you can turn steering wheel back and forth to get ignition key to turn
key is worn... jiggle it whilst turning... make a new key
poor or watered down gas or wrong ignition timing would be best place to start
something wrong with one of the airbag sensors.
Pull really hard!