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What causes the key not to turn in ignition?

Several factors can prevent a car key from turning in the ignition properly:

1. Key and Ignition Alignment: If the key is not properly aligned with the ignition cylinder, it may not turn smoothly. Ensure the key is inserted correctly and straight into the ignition.

2. Damaged Key: A worn, bent, or damaged key can cause issues when turning in the ignition. Inspect the key for any signs of damage or deformation.

3. Clogged Ignition Cylinder: Dirt, dust, or debris can build up in the ignition cylinder, causing the key to stick. Try spraying some lubricant into the cylinder and gently insert and turn the key.

4. Worn-Out Ignition Lock Cylinder: Over time, the ignition lock cylinder can wear out or become damaged, making it difficult to insert the key or turn it. In such cases, the cylinder needs to be replaced.

5. Steering Wheel Lock: Some vehicles have a steering wheel lock that engages when the key is removed. If the steering wheel is turned slightly while the key is inserted, it might prevent the key from turning fully. Try wiggling the steering wheel gently while turning the key.

6. Faulty Ignition Switch: If the ignition switch is defective or has loose electrical connections, it can prevent the key from turning properly. This requires further inspection by a qualified technician.

7. Vehicle Immobilizer: Modern vehicles have an immobilizer system designed to prevent theft. If there's a problem with the immobilizer or its components (e.g., key transponder, receiver, or control unit), it may block the key from turning in the ignition.

If you've tried all these solutions and the key still won't turn, it's recommended to consult with a professional mechanic or locksmith who can diagnose the exact cause and provide an appropriate solution.