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Reprogramming Car Keys Transponder keys are believed to be more secure for cars and harder to copy by thieves. Keys may need to be reprogrammed in event of damage or lost. You can change the programming of your key fobs at home, but you must know the right process. For the best results, you'll need the following items: Keys Most modern cars require a transponder key to operate. This provides security and protection against theft. These keys are programmed by a locksmith or an authorized dealer to work with your car's system and the specific model. They are costly to replace if they are lost and you should keep extras handy. You can purchase key fobs to replace them in online stores and many brick and mortar auto shops. But how can you tell that the new one you have bought is genuine? Can you tell if the unit has been programmed to work with another vehicle, or if it can be programmed differently? To program a new car key first make sure that your vehicle is running. Insert the key that you wish to program into the ignition, but don't turn it. There are only a couple of seconds before the car's system resets commands and then exits programming mode. Therefore, it is essential to move quickly and not be able to wait between steps. To prevent this from happening, shut off the engine. Change the key from “on” to “off” to test the system. The door locks should cycle and you'll hear a chime signalling that the procedure was successful. Certain newer vehicles have rolling key technology, which prevents thieves from using stolen cars' key to start it. This technology is still vulnerable to a technique known as a replay attack which allows thieves to record the signal of the vehicle's key fob and then replicate it to unlock the car. To prevent this, manufacturers have added a security feature called CAN bus protocol to prevent hacking attempts. Certain manufacturers have a unique encryption on their keys that cannot be decoded by an ordinary program. It is best to only attempt this process if your experiences are with electronics. Consult your car's manual or go to the manufacturer's website to find out how to program it. The steps to follow will differ depending on the model of vehicle. Transponder chips Car keys with transponder chips require special reprogramming in order to work. Any hardware store can offer you a new car key, however the real challenge lies in integrating it with your vehicle. A reprogrammed key will need to be compatible with the exact identification number of the vehicle, or it won't start the engine. Transponder chips, used to stop theft of cars are a standard feature of modern automobiles. The chip is a microcircuit which transmits a radio-frequency signal when the ignition key is put in. The car is able to detect the signal and starts the engine only if the signal matches the one programmed into the vehicle. The car also shuts down if the frequency is invalid. This makes it much more difficult for car thieves with no experience to hot wire a vehicle and then start it. A circuit board with an induction coil that connects the chip to the key. When the key is placed in the ignition it creates an electromagnetic field around the transponder. This produces a signal which is absorbed by the coil, which transmits it to the key's identification number. The key's identification number is transmitted back to the car, and the engine starts when the identification number is in line with. There are many methods to program a key transponder, but each requires an instrument that is specifically designed for. You can buy these tools online or from most automotive locksmiths. They're not cheap, but they're essential for programming the chip into your vehicle. You could also use a resettable key that was programmed for a different vehicle. In this scenario, you'll need to make sure that the key is not damaged or the transponder has been altered in any way. To check this, you'll need scanners or computers with a USB port to read the chip and determine its identity. The process of reprogramming the transponder key is easy, but it will require specialized software and a scan tool. If you're new to the process, it's best to seek help from an auto locksmith. Avoid buying used keys as they might already be programmed and won't work with your car. EZ Installer Prior to recently, car owners who wanted to replace their key fob had to visit an agent to have it electronically linked to the vehicle. This is because modern keys require to be “paired” to a specific vehicle in order to function in a way that required the use of expensive and complex equipment that only dealers had access to. The EZ Installer from Car Keys Express solves this problem for retailers and locksmiths by easing the process of connecting modern keys to vehicles. The EZ Installer, a simple “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 standard OBD port of the vehicle, and runs an application that is mobile to provide easy to follow instructions. The EZ Installer works with a wide range of modern vehicles with proximity keys or push-button start. To see if it will work with a specific vehicle, check the compatibility guide on Tom's website. If the device fails to program a remote or a key purchased from Tom's into a compatible vehicle then a full refund is provided. In contrast to traditional programming equipment, which costs key retailers and professionals hundreds of thousands of dollars in “token” fees per key, the EZ Installer Pro does not charge these costs. It is available as long as a key professional or retailer wants. The EZ Installer also eliminates the need for costly monthly service contracts and updates, meaning that it could save retailers money while providing the same quality service as OEM equipment. It also offers a leading warranty that covers both hardware and software for the remainder of your life. Tools Locksmiths, auto mechanics and vehicle owners can use car key programming tools to program new keys for vehicles. These tools communicate with the vehicle's immobilizer system to create new keys and remote controls. These tools can be used to make duplicate keys and to duplicate keys. These tools are an essential tool for anyone who owns a car. One of the most admired car key programming tools is the Autel Maxisys MS906BT. This vehicle diagnostic scanner is compatible with all major brands and offers advanced OE features. It has a key programming feature and can backup the current key information. It can also reset the immobilizer, or clear the fault codes. The OTOFIX IM1 is another important tool for reprogramming car keys. This auto diagnostic scanner is able to read passwords from all major brands and comes with advanced features comparable to OE. It also has the ability to perform online calibration, customization and reading of EEPROM. The tool also has an option to bypass a BMW or Mercedes PIN code. It also has the ability to read EEPROM, car MCU and CAN EEPROM for most major models. The XToolUSA Bidirectional Scanner is another popular choice for reprogramming vehicles. It can read codes and key information from most vehicles in a few seconds which makes it a perfect tool for auto shops and locksmiths. It also features an active test function that helps determine the cause quickly and effectively. There are a myriad of ways to reprogram your car. It is important to have the right tools and to understand how they function. Incorrect programming can cause damage to the vehicle's immobilizer system and prevent it from starting. It is advised to consult a professional before attempting to reprogram a car key. You can also purchase a kit that includes the key programmer, a remote control key and transponder chip. This will help ensure that you have everything you need to reprogram your car key. This method takes longer and requires expertise in soldering and electronic devices.