To effectively diagnose why the key won't turn in the ignition of your 1997 Buick Century, start with the simplest solutions before progressing to more complex issues. Begin by checking the steering wheel lock, as a locked steering wheel can prevent the key from turning. Gently turn the steering wheel while attempting to turn the key, as this may unlock the mechanism. Next, inspect the ignition lock cylinder for any signs of wear or misalignment. If the springs inside are stuck, using a tool to create vibrations can sometimes realign them. Additionally, look for any debris or corrosion within the ignition lock, as cleaning it with a soft brush or applying a silicone lubricant can often resolve the issue. If these steps do not yield results, consider the ignition switch, which may need replacement if it has been previously diagnosed as problematic. If the problem persists after these checks, it may be time to consult a professional mechanic for a thorough diagnosis and repair. By following this structured approach, you can systematically identify and address the issue with your ignition key.

When dealing with a 1997 Buick Century where the ignition key refuses to turn, several common problems may be at play. One of the primary culprits is a faulty ignition switch, which can wear out over time and prevent the key from engaging properly. If the steering wheel has been turned too far while the key is out, it may lock, requiring a gentle turn of the wheel to unlock both the steering and ignition. Additionally, the key itself could be the issue; corrosion or dirt buildup on the key can hinder its ability to turn in the ignition, so cleaning it thoroughly may help. Another possibility is a malfunctioning ignition lock cylinder, which might necessitate the use of tools to create vibrations that assist in turning the key or, in some cases, a complete replacement. For those with automatic transmissions, the neutral safety switch could be misaligned, so ensuring the gear selector is fully in the neutral position is essential. Electrical issues, such as corroded connections or loose wires, can also prevent the car from starting, making it important to inspect and clean these areas. Lastly, if the Vehicle Anti-Theft System (VATS) is activated, it may block the ignition from turning, requiring a reset of the car's computer or bypassing the system. By understanding these common problems, DIYers can effectively troubleshoot and potentially resolve the ignition issues in their Buick Century.