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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 programmed again in the case of damage or lost. You can reprogram your key fobs at home, but you must be aware of the correct procedure. For the best results you should have the following items: Keys Most modern vehicles require a transponder fob or transponder keys to work, which provides security and protection against theft. The keys have to be programmed to the specific car and its systems by a licensed locksmith or dealer. They are expensive to replace if lost, so you should keep extras handy. You can find key fobs to replace them in online stores and many brick and mortar auto shops. But how can you tell that the one you have bought is authentic? Can you tell whether it was programmed for another car or if it can be reprogrammed to fit your vehicle? To program a new car key, you must first verify that your vehicle is operating. Insert the key you want to program into the ignition, but don't turn it. There are only a few seconds before the car's system resets the commands and leaves programming mode. This is why it is crucial to be quick and not be able to wait between steps. Stop the engine to prevent this. You can test the car's system by turning the key to the “on” position and then back to the “off” position. You should hear a sound signalling that the procedure was successful. The door locks will be able to cycle. Certain vehicles of recent years use rolling keys to keep thieves from using stolen keys to start the car. This technology is still vulnerable to a technique dubbed a replay attack, which allows thieves to record the signal received from the key fob of the car, then reproduce it to open the car. To stop this, manufacturers have added the security feature known as the CAN bus protocols to prevent hackers from gaining access to the vehicle. Some manufacturers also use special encryption on their key fobs, that cannot be decoded with an ordinary program. These kinds of cars require programming by a professional, so you should only try this only if you've worked with electronics. It is recommended to refer to the owner's manual for your car or search for the manufacturer online, as the steps will differ depending on the car model. Transponder chips Car keys with transponder chips require special reprogramming in order to function. While any hardware store can cut a new key for you, the real problem is to make it work to work with the specific car you own. The key has to be programmed to match the exact identification number on your vehicle, or else it will not start. Transponder chips, which are used to stop theft of cars are a standard feature of modern cars. The chip is a tiny microcircuit that transmits a radio-frequency signal when the ignition key is put in. The car then scans for the signal and then starts the engine if it is in line with the original frequency that was programmed into the vehicle. The car is also programmed so that it will shut down when it detects an incompatible frequency. This makes it much more difficult for thieves who are not experienced to connect a vehicle with hot wires and start it. The chip and the key are connected via an electronic circuit board that contains an induction coil. When the key is placed in the ignition it creates a magnetic field around the transponder. This creates a signal which is taken up by the coil and then transmitted to the key's identification number. The key's identification code is returned to the car and the engine will start when the identification number is in line with. There are several ways to program a transponder key, however, all require an instrument that is specifically designed for the purpose. These tools can be purchased through the internet or from many automotive locksmiths. They are not cheap, but they are essential for programming the chip in your vehicle. You could also use a resettable key that was programmed for a different vehicle. In this scenario, make sure that the key has not been damaged or the transponder is not altered in any way. You can read the chip with a scanner, or a computer with a USB connector. Reprogramming the transponder is a straightforward procedure, but it requires specialized software. It also requires the use of a scanner. It is recommended to contact an auto locksmith for help in case you're not an expert. Don't buy used keys since they might already be programmed and won't work with your vehicle. EZ Installer Prior to recently those who wanted to replace their keys were required to visit a dealer to have it electronically paired with the vehicle. This is because, in order to make modern keys work they have to be “paired”. This required expensive and complex equipment that was only available to dealers. The EZ Installer from Car Keys Express solves this problem for locksmiths and retailers by making it easier for connecting modern keys to vehicles. The EZ Installer is a simple, “plug and play” OBD device that connects new keys with vehicles without the need for expensive equipment or programming tokens. It connects directly to the vehicle's standard OBD port and utilizing an app for mobile devices to provide easy-to-follow instructions. The EZ Installer is compatible with all modern vehicles with proximity keys or push-button start. Check the compatibility guide at Tom's website to see whether your vehicle is compatible. If the device fails to program a remote or key purchased from Tom's into a vehicle compatible the full refund will be provided. Contrary to conventional programming equipment that can cost retailers and key professionals thousands of dollars with typical per-key “token” costs, the EZ Installer Pro doesn't charge these fees at all which means it can be used as long as a key professional wants to use it. The EZ Installer also eliminates the necessity for expensive monthly service contracts and updates, so it will save retailers money while still offering customers the same high-quality service as OEM equipment. It also comes with a renowned warranty that covers hardware and software for the rest of your life. Tools Car key programming tools can be used by auto technicians, locksmiths and owners of vehicles to programme new keys for their automobiles. These tools communicate with the vehicle's immobilizer in order to program new keys, and are remotely controlled. They can also be used to clone existing keys and create duplicates. These tools are an essential tool for anyone who owns a car. One of the most popular tools for programming car key s is the Autel Maxisys MS906BT. This scanner for vehicle diagnostics is compatible with all major brands and comes with advanced OE features. It also has a key programming function and the ability to save current important data. It also resets the immobilizer, or clear the fault code. Another important tool to reprogramme car keys is the OTOFIX IMM1. This auto diagnostic scanner comes with advanced functions that are OE-level and can read passwords from most major brands. It also performs online calibration and customization as well as reading EEPROM. It also comes with an option to bypass the BMW or Mercedes PIN code. It can also read EEPROM, car MCU and CAN EEPROMs for all major models. The XToolUSA Bidirectional Scanner is another popular choice to reprogramme cars. This is a wonderful tool for auto repair shops as well as locksmiths as it can read key codes and other data from the majority of vehicles in a matter of minutes. It also features an active test feature that helps identify the issue quickly. While there are many different ways to reprogram a car it is crucial to select the appropriate tools and to be aware of how to use them. Incorrect programming may cause damage to the immobilizer on the vehicle and prevent it from starting. Before attempting to program your car key, it's best to consult with a professional. You can also purchase a kit that includes the key programmer, a remote control key and transponder chip. This will ensure that you are supplied with all the tools you need to reprogram your car's key. However, this method will take more time and requires some understanding of electronic circuits and soldering.