* Worn ignition cylinder: This is the most common culprit. Over time, the tumblers inside the cylinder wear down, making it harder for the key to engage and turn. This is often due to simply using the key many times.
* Bent key: A slightly bent or damaged key won't align correctly with the ignition cylinder's tumblers, leading to resistance.
* Steering wheel lock: The steering wheel lock mechanism can bind, preventing the key from turning. Gently jiggling the steering wheel while turning the key might help diagnose this. If the steering wheel feels stiff, it's likely the source.
* Broken or worn ignition switch: The ignition switch itself might be malfunctioning or worn, preventing the cylinder from turning smoothly. This is less common than a worn cylinder, but still possible.
* Sticky or broken tumbler: One or more of the tumblers within the ignition cylinder might be stuck or broken. This would impede the key's ability to rotate.
* Damaged ignition lock housing: The housing itself may be damaged or warped.
* Low battery: In some cases, a very weak battery can contribute to a hard-to-turn ignition, but this is usually accompanied by other symptoms like slow cranking.
* Shift lever not in park (automatic): The car's safety mechanism may prevent the key from turning unless the automatic transmission is in Park. Ensure this is the case.
Troubleshooting Steps:
1. Check the steering wheel: Gently wiggle the steering wheel while trying the key.
2. Inspect the key: Check for bending or damage. Try a spare key if available.
3. Try jiggling the key: Gently move the key back and forth while trying to turn it. This might help it align with the tumblers.
4. Ensure the transmission is in Park (automatic): This is crucial for safety.
If none of these work, it's best to consult a mechanic. Attempting to force the key can cause further damage. A replacement ignition cylinder is a relatively common and inexpensive repair, but a professional can diagnose the exact problem and provide the best solution.
