Smart Key

 Also known as “keyless ignition,” a smart key is associated with vehicles that have a start button on the dash. Smart-key technology operates via a proximity sensor in the vehicle that automatically knows when the smart key (which is not a key at all, but a paired sensor) is nearby. It then unlocks the vehicle and allows it to be started with the push of a button.

If you lose it: Like the transponder key, you’ll need to tow your car to the dealership if you don’t have a backup key, then order a key (if the dealer doesn’t have one in stock) and have it paired to your vehicle. The costliest of the keys, these can run upward of $320 to replace, with a possible towing charge on top of that.

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