As cars get older, ignition key lock cylinders sometimes wear to the point that the key will no longer turn to start the car. If it is no longer covered by a warranty, replacing the ignition lock cylinder can be a time consuming or expensive proposition, but there is another alternative.
Check all keys for signs of wear or damage. If the keys are worn or damaged, then a new key could be obtained from the manufacturer. If a worn or damaged key was the problem, then getting a new key might work. However, if the ignition's key lock cylinder is also worn, a new key from the manufacturer will not work because it would fit the cylinder in its original, unworn condition.
Contact an experienced locksmith who can make a new key that matches the ignition lock cylinder in its current, worn state.
Check the new key in the other car locks because it might not work. You might need to use the original keys to open the doors, trunk, and glove compartment.
