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If you own a basic mechanical key you should be able to purchase a replacement car key fobs from any hardware store for relatively affordable. This key will need to be programmed either by a locksmith or a dealer.

Smart keys are more complicated and require a visit to the dealer to connect them to your car. They are costly however many car insurance companies will cover the cost.

Mechanical Keys

There are still car keys that are purely mechanical, the kind that you insert into an ignition lock cylinder and then turn to start your vehicle. If your car uses one of these, it's cheap to replace the fob and key (if lost or stolen).

A locksmith can design a new basic key at a lower cost than what you buy from a dealer. You can also ask a neighbour or friend who knows how to program transponder keys aftermarket (which are cheaper than the keys that are factory-made) to make you a spare key and program it. Getting a spare is important because modern cars won't start when a key that isn't programmed with the correct chip is used.

Transponder keys look a lot like mechanical keys, however they contain a hidden electronic chip inside the base of their plastic design that communicates with your car's computer system. Your vehicle will recognize the code inside the chip and accept it, however it will refuse to start if any other code is utilized.

If your spare key is equipped with chip, you'll need to take it to a dealership to have it programmed. The dealership will need an equipment that is specifically designed for cutting and programming the key. The machines are available at certain dealerships. It is unlikely that a locksmith would have the equipment needed to create a key with transponder.

Keys with remotes cost a lot to replace, particularly in the event that you need a spare. If you have just the key shank missing, and a working replacement fob, you can try to reprogramme your fob by yourself. However, it can be time-consuming and challenging. You're better off going to a dealer in the event that you've lost both the fob and the key.

There are other kinds of car keys that require a more specific set of skills to replace, for example flip keys and smart keys. These are more complicated and need to be replaced by the dealer. Certain key fobs operate by a proximity sensor or a door opener that is spring-loaded.

Transponder Keys

If your car is built in the last 10 years or so you're likely to use a transponder key system. These keys contain an embedded microchip and a receiver that is programmed to communicate with start your vehicle.

Transponder keys are a great way to discourage theft because they require two parts in order for the car to start which is the transmitter (transponder) inside the key and the receiver that is connected to your immobilizer system. Without both the key and the immobilizer system present the car will not start and it will be impossible to connect hotwire.

The key chips are programmed with a unique serial number that is unique to the vehicle you own. When the key is inserted into the ignition the serial number is then sent to the cars immobilizer and then verified to make sure it is in line the number, which allows the engine to start. This security feature is only defeated by a special device which can read the chip and match it to another vehicle.

You'll require a locksmith that has the tools to reprogram your key. Some car dealerships offer this service, but their overhead makes them more costly than an independent locksmith.

It isn't easy to find a new key with a chip. To program your car, the key needs to be programmed on a specific machine. This requires specialized software and the right key cutter in order to be done correctly.

Certain of the more basic chip keys can be copied at most auto part stores but you must know the serial number of the original key to ensure the proper information is being encoded into the new key. Many people make the mistake of going to their dealer to have their chip key copied, and end with a bill that is higher than what they need to.

Laser-Cut Keys

Laser-cut keys are also referred to as sidewinder key because of the distinctive winding cut that is made on the shank of the key. They add an extra layer of security to your car. These keys are a great protection against auto theft since they require special equipment to duplicate.

They also come with built-in chips to stop the copying of keys by unauthorized people from starting your vehicle. They have a unique number that must be programmed to your car key replacement in order to unlock it and begin it. This additional level of security is a fantastic option to protect your investment and deter thieves who may be trying to steal your car to make parts or sell it.

Laser-cut keys differ from mechanically cut keys in terms of design. They have fewer grooves cut on the key. They also have a thicker key shaft, which is a good indication that it's not your regular car key replacements key. Generally, locksmiths use a machine called milling tool to cut these kinds of keys. This kind of tool looks similar to a drill bit and is designed to cut metal at very precise and controlled angles.

They're among the most secure keys you can purchase for your car, because they're very hard to replicate and can only be cut by the locksmith who is a certified dealer. Unlike traditional keys, they're made from a small piece of steel that's made into a code, and then cut using the laser in the factory. This type of key is able to withstand a lot wear and tear, and is one of the best options to protect your vehicle.

The key can be folded in the fob, or it can be released by pressing a button. Keys like this are used extensively in German automobiles and provide an additional layer of security against car thieves. The cylinder is resistant to breaking into, making it very difficult for a thief pick or pick-lock the car.

Smart Keys

Unlike the traditional single piece of carved metal smart keys make use of RFID, or radio-frequency identification for short, to communicate with the car. They are equipped with a chip that has a unique code, which is encoded on every key. When you open your car's doors or open the trunk key, it transmits a signal to your vehicle's computer onboard. The computer then prompts the correct frequency and allows you to connect to your car and start it.

The chip of the smart key comes with a variety of security features to guard it from theft. First the key emits a low-frequency signal that isn't picked up by any receiver other than your vehicle. If the computer onboard detects this signal, it will trigger an alternative one that's an individual sequence that only your car can recognize. This will stop a tech-savvy criminal from using a pulse generator in order to "fool the system" and perform the work on other vehicles.

In addition to locking and starting the car, certain smart keys have special features such as storing particular driver preferences remote opening windows or the sunroof, and many more. These can be done by activating the key's proximity sensor by pressing a button on the key itself, or, in some instances, by twisting a tiny metal piece inside the key.

Some key fobs can be opened by holding the dead key in a slot or by placing it near an inductive coil that is located on the dashboard. Some key fobs feature a mechanical (fully emergency car key replacement) key blade inside the key.

Replace a smart key requires an appointment with a dealer, who can either request the replacement car keys or have it in stock. They'll also need to program the new key to recognize the car you are driving. You can go to a locksmith shop to have your replacement key fob programmed and replaced. A locksmith will charge more than dealers, but he or she can do the job quicker and at a lower cost.