The usual reasons a car key or fob quits, and how each one gets sorted.
A car key stops working for a handful of common reasons: a worn key blade, a dead fob battery, a chip or fob that has lost its pairing, a worn ignition, or a key that has cracked inside. The fix depends on which one it is, and our car locksmith team can tell them apart at your vehicle.
Worn metal keys round off over years of use until they no longer line up the pins. A fresh cut, or a code-cut key, brings it back. For chipped keys, the electronics can drop their pairing, which calls for transponder programming. For remotes and push-button fobs, a dead battery or lost pairing is common, handled through fob service or a new fob.
If a known-good key will not turn or start the car, the ignition cylinder may be the cause. A key that snapped off needs broken key extraction before anything else. Once you have a key that works, a backup through car key copying keeps a single failure from stranding you.
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If you only take one thing from this, take this: handling a lock problem on purpose, before it becomes a crisis, is almost always cheaper and calmer than handling it in a panic at the worst possible moment. A little planning, a spare key, a rekey after a move, goes a long way.