A Car Seat Replacement Key is a Costly and Time Consuming Process
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Keys stolen or lost
The replacement of a key is a costly and time-consuming process. In addition to the cost of a new key you could need to have the vehicle towed and have your car's computer chip re-paired with the new key, which can be very costly.
Making sure you don't lose your keys is an excellent method of saving time and money. Consider adding a brightly colored reflective piece of your keychain, or painting the bow of your key a hue that is noticeable. It's also an excellent idea to keep a copy of your seat replacement key in a safe place in case you lose the original.
If seat leon spare key spot your key, you can examine the code stamped onto the bow. This information will help you determine if it's the correct key for the seat you are using.
Transponder Chip Keys
Transponder keys, also referred to as key FOBs or chip keys (fobs which control your key), are one of the most widely used types of car key. They've been around for over 20 years and are designed to ward off theft by sending a coded message once inserted into your car's ignition.
A transponder is actually a microchip inside the plastic cover of your car key. When the key is fitted into a key FOB or the ignition of a car, it sends an extremely low-level radio signal (ECU) to the vehicle. The ECU recognizes a unique digital serial number on the chip, and responds in a manner that is consistent with the serial number. If the signal matches then the engine will start.
Although transponder chips aren't foolproof, they're a great way to prevent auto theft. The idea behind these kinds of car keys is actually quite old that dates back to World War 2 era military planes that used coded messaging to differentiate them from enemy planes.
A locksmith can create a duplicate transponder for you when you're locked out and require a new. This process is a little more complicated than simply rekeying your standard key, but the chip in the new key has to match with the receiver inside your car's system. This is why buying the duplicate key from a dealership can be more costly.
Keys Laser Cut Keys
Car keys cut with lasers are carved with grooves on both sides, unlike mechanically cut keys that can only be turned one way. This makes them more difficult to duplicate and they can only be inserted into the ignition or lock on either side. Also known as sidewinder key, these are a step above the standard transponder key/chip key and offer more security in the event of theft.

To create a Laser Key the locksmith first needs to identify the cuts from the key fob that is already in place in order to determine the type of blank that should be used. Then, they must set up the key cutting machine to cut the key in line with the original cuts. This requires a key cutting machine that is more sophisticated than the wheel-based duplicaters available in hardware stores.
Although they are more costly than regular keys, they can provide additional security for your vehicle. Laser keys cannot be duplicated using the same tools used to produce standard edge-cut keys. This means that it is not possible to practice "key-jumping," where a car key is programmed for different vehicles, allowing it to open the lock or start the engine. The keys can only be retrieved by an experienced locksmith or a dealership.