1. Key Issues:
* Wrong Key: The most obvious! Try a known good key.
* Broken/Worn Key: A worn key might not turn the tumbler properly. Try a spare key. If the problem persists with multiple keys, the tumbler itself might be worn.
* Key Stuck in the Ignition: If the key is stuck, try gently wiggling it while turning the steering wheel back and forth. Sometimes the steering wheel lock mechanism is binding. If it's really stuck, excessive force could damage the ignition.
2. Steering Wheel Lock:
* Steering Wheel Locked: The steering wheel lock mechanism engages when the car is turned off. Gently try to turn the steering wheel back and forth while attempting to turn the key.
3. Ignition Switch Problems:
* Ignition Switch Failure: The ignition switch itself might be faulty. This is a more complex issue.
* Wiring Problems: A short circuit or broken wire could prevent the ignition from working correctly. This often requires professional diagnosis.
* Shift Lever Issues (Automatic Transmission): Make sure the gear selector is in "Park." The ignition will usually not turn unless it's in Park.
What to Do:
1. Try the obvious first: Check the key, wiggle the steering wheel, and ensure the gear selector is in Park.
2. Check the Fuses: Look in your owner's manual for the fuse box locations and check fuses related to the ignition system.
3. Professional Help: If the above steps don't work, it's time to call a locksmith or a mechanic. Trying to force the ignition could cause more damage. A locksmith is often the best option for dealing with lock problems, while a mechanic would be better equipped to handle electrical or ignition switch issues.
Important Safety Note: Never attempt to bypass or hotwire the ignition system. This is illegal and extremely dangerous.
A mechanic or locksmith will be able to diagnose the specific problem and provide the correct solution, which could range from replacing a worn key to repairing or replacing the ignition switch itself. They have specialized tools to avoid causing further damage.
