* Steering Wheel Lock: This is the most common culprit. The steering wheel is mechanically linked to the ignition. If the steering wheel is slightly turned, the lock mechanism engages to prevent theft, locking the ignition. Try gently jiggling the steering wheel while trying to turn the key.
* Key Problems:
* Worn Key: A worn or damaged key may not properly engage the ignition tumbler.
* Incorrect Key: Using the wrong key will obviously lock the ignition.
* Broken Key: A broken key fragment stuck in the ignition cylinder can prevent it from turning.
* Ignition Switch Issues:
* Faulty Ignition Switch: The ignition switch itself might be malfunctioning internally, failing to disengage the lock mechanism or failing to respond to the key. This is a more serious mechanical problem.
* Wiring Problems: Damaged or corroded wiring to the ignition switch can prevent it from functioning correctly.
* Shift Lever Problems (Automatic Transmission): On automatics, the ignition is often interlocked with the transmission. Make sure the gear selector is firmly in Park (P). If it's not fully in park, the ignition won't unlock.
* Security System Issues: A malfunctioning anti-theft system (PATS - Passive Anti-Theft System) might be preventing the ignition from turning. This usually involves the car not recognizing the key's transponder chip.
* Damaged Ignition Cylinder: The ignition cylinder itself could be damaged or worn out.
Troubleshooting Steps (in order of ease):
1. Jiggle the Steering Wheel: Gently try to move the steering wheel back and forth while turning the key.
2. Check the Gear Selector (Automatic): Ensure the gear selector is firmly in Park (P).
3. Try a Spare Key: If you have a spare key, try using that. If the spare works, the problem likely lies with your original key.
4. Check for Obstructions: Inspect the keyway for any debris or broken key fragments.
If none of these steps work, you'll likely need professional help from a locksmith or a Ford mechanic. Attempting to force the ignition can cause further damage. They will be able to diagnose the problem more accurately and perform the necessary repairs or replacements.
