When faced with the frustrating issue of an ignition key that won't turn in your 1995 Buick LeSabre, it's essential to adopt a methodical diagnostic approach. Start by examining the simplest potential causes first, such as checking for physical obstructions in the ignition slot. Sometimes, dirt or debris can accumulate, preventing the key from turning smoothly. If the ignition mechanism appears clean, inspect the key itself for any signs of wear or damage, as a worn key may not engage properly with the ignition system. Next, consider the Vehicle Anti-Theft System (VATS); ensure that the VAT resistor on the key is intact and matches the vehicle's specifications. If the key is not the original or has been cut incorrectly, it may not function as intended. If these initial checks do not resolve the issue, move on to the ignition switch and electrical connections, looking for signs of corrosion or damage that could impede functionality. Lastly, if all else fails, investigate the transmission neutral safety switch and the vehicle's security system, as these components can also prevent the ignition from engaging. By following this structured approach, you can effectively diagnose and address the problem, restoring your vehicle's ignition system to proper working order.

When dealing with a 1995 Buick LeSabre 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 disrupt the electrical flow necessary for starting the vehicle. Additionally, the Vehicle Anti-Theft System (VATS) can pose challenges; if the key's resistor is incorrect or damaged, it may prevent the ignition from engaging. Corrosion on battery terminals is another frequent issue, as it can impede electrical connections, so inspecting and cleaning these areas is essential. Furthermore, the transmission neutral safety switch must be functioning correctly, as it ensures the vehicle is in park or neutral before allowing the engine to start. Problems with the starter motor or its relay can also hinder ignition, even if the starter itself is new. Lastly, the condition of the key and ignition slot should not be overlooked; a worn key or debris in the ignition can make turning the key difficult. By systematically checking these components, DIYers can often identify and rectify the issue, restoring functionality to their vehicle's ignition system.