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Reprogramming Car Keys Transponder keys are said to be more secure for cars and are more difficult to copy by thieves. Keys may need to be reprogrammed in case of damage or lost. You can reprogram your key fobs at home, but you need to be aware of the correct procedure. For the best results you'll need the following items: Keys Most modern cars require a transponder key to operate. This provides security and anti-theft protection. These keys are programmed by a locksmith or authorized dealer to work with the car's systems and specific model. They can be costly to replace if they are lost therefore, it is recommended to keep spare keys in the car. You can purchase replacement key fobs in online stores, as well as numerous brick-and-mortar auto shops. How do you ensure that the one you purchased is genuine? Do you know whether the unit is programmed to work with a different vehicle or if it could be programmed again? If you are planning to program an entirely new key the first step is to ensure that your car is operating. Insert the key you wish to program into the ignition, but do not turn it. You have only a few seconds before the system will reset all commands and exits the programming mode. It is important that you move quickly and don't wait between each step. Turn off the engine to stop this. Change the key from “on” to “off” to test the system. You should hear a chime signalling that the procedure was successful. The door locks will be able to cycle. Certain newer vehicles utilize rolling key technology to prevent thieves from using stolen keys to open the car. The technology is still susceptible to a method known as replay attacks which allows thieves to record the signal from the key fob of the car and reproduce it later to open the car. To combat this, manufacturers have added a security feature known as the CAN bus protocols to ward off hackers from gaining access to the vehicle. Some manufacturers use a special encryption on their keys that cannot be decoded by a simple program. It is best to only attempt this method if you have experience is with electronics. It is recommended to consult your car's owner manual or search for the manufacturer on the internet , since these steps vary by vehicle model. Transponder chips Transponder chip car keys require a special reprogramming to work. Any hardware store can offer you a new car key, but the real challenge is in implementing it to your car. A key that has been reprogrammed will need to match the specific identification number of your car otherwise it won't even start the engine. Transponder chips are a typical feature of modern automobiles and are designed to stop car theft. The chip is a microcircuit that transmits a radio frequency signals when the key is put into the ignition. The car then detects the signal and begins the engine if it matches the original frequency that was programmed into the vehicle. The car also shuts down if a frequency is not valid. This makes it much more difficult for novice car thieves to hot wire a vehicle and then start it. The chip and the key are linked by an electronic circuit board that contains an induction coil. When the key is placed in the ignition it creates a magnetic field created around the transponder. This generates a signal, which is received by the coil before being sent to the key identification number. The ID number of the key is sent back to the vehicle and if it matches the engine will start. There are many ways to program a key transponder, but each requires an instrument that is specifically designed for. These tools can be bought through the internet or from many automotive locksmiths. They're not cheap, but they're vital for programming the chip in your car. You could also make use of a transponder key that can be reprogrammed that was previously programmed for a different vehicle. In this instance, you must ensure that the key has not been damaged or that the transponder is not altered in any way. To accomplish this, you'll need scanners or a computer equipped with an USB port to read the chip and determine its identity. Reprogramming an transponder's key is simple, however it requires special software and a scanning tool. It's best to ask an auto locksmith for assistance in case you're not an expert. Also, avoid buying second-hand keys as they are likely already programmed and will not be compatible with your car. EZ Installer Prior to recently those who wanted to replace their keys were required to visit an authorized dealer to get it electronically linked to the vehicle. This is because, in order to make modern keys function they must be “paired”. This required expensive and complicated equipment that was only available to dealers. The EZ Installer by Car Keys Express simplifies the process of pairing modern keys with vehicles used by locksmiths and retailers. The Easy Installer, a straightforward “plug-and-play” OBD device, connects new keys to vehicles without the need for complicated equipment or tokens to facilitate programming. It connects directly to the vehicle's standard OBD port and using an app for mobile devices to provide easy-to-follow instructions. The EZ Installer works with most modern vehicles that include proximity keys or push-button start. Visit the compatibility guide on Tom's site to see if your vehicle is compatible. If the device fails to program a remote or a key purchased from Tom's into a vehicle compatible the full refund will be available. In contrast to traditional programming equipment, which can cost key professionals tens of thousands of dollars in “token” fees per key, the EZ Installer Pro does not charge these fees. It is available for as long as the key professional or retailer wants. The EZ Installer also eliminates the requirement for expensive monthly service contracts and updates, meaning that it can save retailers money while still providing customers with the same high-quality service as OEM equipment. It also offers an industry-leading warranty that covers all hardware and software for life. Tools Locksmiths, auto mechanics, and vehicle owners can use car key programming tools to create new keys for cars. These tools communicate with the vehicle's immobilizer to create new keys, and are remotely controlled. These tools can be used to make duplicates and make keys cloned. These tools are an invaluable tool for anyone who owns a vehicle. Autel Maxisys MS906BT is among the most sought-after tools for programming keys for cars. This scanner for vehicle diagnostics offers advanced OE-level features and is compatible with the majority of the major brands. It comes with an important programming feature that can backup the current key information. It can also reset the immobilizer or erase the fault codes. The OTOFIX IM1 is an important tool to reprogramme car keys. This auto diagnostic scanner is able to read passwords for most major brands, and it comes with advanced OE-level features. It also performs online calibration as well as customization and reading of EEPROM. The program also has a feature to bypass a BMW or Mercedes PIN code. It is also able to read EEPROM, car MCU, and CAN EEPROMs for the majority of major models. The bidirectional scanner XToolUSA is another popular option to reprogramme vehicles. This is a wonderful tool for auto repair shops and locksmiths as it can read key codes and other data from all vehicles in just a few minutes. It also comes with a live test function that helps determine the cause quickly and effectively. There are a variety of ways to reprogram your car. It is important to have the proper tools and to understand how they work. Incorrect programming can cause damage to the car's immobilizer system and prevent it from starting. Before you attempt to program your car key, it is best to consult an expert. You can purchase a kit that includes keys, a key programmer, remote control key and transponder chip. This will ensure that you have everything you need to reprogram your car key. This process is more time-consuming and requires a basic understanding of soldering and electronic devices.