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Car Key Cutting Explained Cutting the car key is more than just bending a piece metal. It is a complex process that guarantees security, function and durability of keys. It is not unusual to lose keys to your car, or have them break in the lock. To ensure that you can always drive your car you'll need a new key cut. Transponder Keys If your car was built within the last 20 years, it is likely that it has a transponder chip. These microchips are in the key's handle and transmit a signal the onboard computers of yo