* Steering Wheel Lock: This is the most common cause. The steering wheel might be slightly turned, engaging the lock mechanism and preventing the key from turning. Gently jiggle the steering wheel while trying to turn the key.
* Worn Ignition Switch: The ignition switch itself could be worn out or damaged. Over time, the tumblers inside can become misaligned or break, preventing the key from turning freely. This often requires replacement of the ignition switch, a more significant repair.
* Broken or Damaged Key: A damaged or worn key, especially one with broken or bent teeth, may not properly engage the ignition cylinder. Try a known good key if possible.
* Shift Lever Not in Park: The car's automatic transmission must be firmly in the "Park" position for the key to be removed. Make absolutely sure the shift lever is fully engaged in Park.
* Faulty Electrical System: While less common, a problem in the car's electrical system (like a short circuit) could be interfering with the ignition system, preventing the key from turning.
* Debris in the Ignition Cylinder: Dirt, dust, or other debris can accumulate in the ignition cylinder, obstructing the key's movement. Attempting to carefully clean the cylinder (with compressed air, for example) might help, but proceed cautiously.
* Ignition Cylinder Problem: The ignition cylinder itself might be damaged or worn, requiring replacement. This is a more involved repair.
What to do:
1. Try the steering wheel: Gently jiggle the steering wheel while trying to turn the key. This is often the solution.
2. Check the gear selector: Ensure the vehicle is firmly in "Park."
3. Try a different key: If you have a spare key, try it. If the spare works, the original key is likely the problem.
4. Consult a mechanic: If none of the above solves the issue, it's best to consult a qualified mechanic. Attempting to force the key could cause further damage. They can properly diagnose the problem and recommend the necessary repair (which could range from a simple cleaning to a more expensive ignition switch or cylinder replacement).
Caution: Do not force the key. This can worsen the problem and potentially cause additional damage to the ignition system.
