
What Actually Causes Ignition Failures and Key Breakage
Car ignitions fail for a wider range of reasons than most drivers realize. A worn key that has been copied one too many times gradually loses its precise cut profile, putting uneven stress on the wafer tumblers inside the cylinder every time you turn it. Over time those tumblers wear grooves into the brass or nickel-silver key blank, and eventually the key either refuses to turn or snaps under torque. New York's climate accelerates this process — road salt migrates into door and ignition cylinders during winter, lubricants dry out, and the constant stop-and-go of city driving means your ignition gets cycled far more often than the national average.
Beyond normal wear, a bent steering column from a minor fender-bender, a failing ignition switch module, or even a heavy keychain swinging from the cylinder can cause the internal wafer stack to shift out of alignment. The result is the same: a key that won't turn, won't come out, or that has already broken off inside the lock face. Attempting to force the issue with pliers or a screwdriver almost always makes extraction harder and can score the cylinder walls, turning a simple fix into a full cylinder replacement.



