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How to Program a Car Key Modern cars have more than just a single key to start the engine They also come with a remote that can lock and unlock doors These key fobs must be programmed to work It is possible to preprogram some car keys by the owner but it is advised to consult an expert This will avoid any damage to the cars computer system and also ensure that the new key functions properly How do you program a key Up until the turn of the 21st century most cars used basic key systems The keys themselves were just metal with grooves that matched the internal parts of the ignition cylinder As technology advanced more and more car makers began to combine electronic and physical protocols in order to prevent theft These key systems are known as transponder keys or chip keys and theyre designed to make it difficult for thieves to open the vehicle The key chips in the keys have a unique serial number that transmits a signal to the receiver inside of your car The signal is compared to an identifier in the cars computer when it is received If the codes match the car will begin to start If the codes dont match your car wont even start This is one of the primary reasons why you should always keep a spare key for your vehicle particularly if you have transponderbased systems If youre interested in learning how to program keys youll require certain equipment Youll also need an uncut key that matches your specific model and make programming car keys can be bought at an auto dealership or from locksmiths but you must make sure that they are the correct ones If you use a key for another model it wont function Start the process by inserting the new key in the ignition and turning it to on It is necessary to keep the key in this position for approximately 10 minutes and 30 seconds When the time has passed you can take out the key and see whether the security indicator on your dashboard was gone If it didnt then youll have to do it again for a third time This method is only compatible with GM vehicles and its not completely secure If youre looking for a secure and reliable option then you should visit a locksmith or dealer to get your car programmed using an embedded chip They will have the tools and equipment needed to access the onboard diagnostic port of your car and make the switch Keyless Entry Systems Keyless entry systems give access to properties without the need for a physical credential They make use of sensors in conjunction with an onboard computer for security It is possible to manage and monitor the system from anywhere within the property Keys and locks are not required The system can also detect lost or stolen cards and then deactivate them The newest models also allow remote management and configuration and are cloudbased Most modern cars are equipped with the keyless entry system To enable this feature the car emits radio signals that are detected by a particular key fob The signals are then compared against the correct code that is stored in the cars computer and when everything is in order the car will be able to unlock If the signals dont match then the car wont start There are several steps you can follow to program your new key fob if its not already programmed The first step is to ensure that all doors are locked except for the drivers side Youll need to have the original key fob and any extras that you want to program You can also try your local auto parts shop because they might have the right tool to program your vehicle If none of these options work youll have to consult your owners manual or an expert locksmith Once youve got the proper tool follow the instructions of the manufacturer to begin programming your key fob This process is often relatively simple and quick For example you might be asked to insert your new key into the ignition while keeping all doors shut and then press a button on the key fob within a short time period The car might respond by reversing the doors or emitting an audible chime as a sign that the key was successfully programmed Many locksmiths use special tools to get around the EEPROM security features that are built into your cars remote or key fob But its a risky method and comes with the possibility of corrupting the data on the computer in your car It is recommended to have an expert handle this as they will be able to lower the chance of data corruption and also ensure that your keys are correctly programmed Transponder Keys Transponder keys sometimes referred to as chip keys come with a microchip embedded in the head of the key When the key is inserted into the barrel of the ignition lock and turned to ON the antenna ring emits an electromagnetic energy blast through the transponder chip The energy is absorbed by the chip and it transmits the radio frequency signal which includes an identification code that is matched with the unique digital serial number in the cars computer system This will prevent any an unauthorized attempt to start the car because only a valid key will be able to perform the task The technology is believed to be more secure than traditional car keys because it makes it difficult for thieves to hot wire a vehicle and start it Its not foolproof and thieves have found ways of tricking and defeating the system So even cars with transponder keys arent immune to theft You might be able to program a transponder key on your own when you have a key programmer compatible with your car The key programmer will come with a stepbystep guide that will guide you through the process of programming your key Once you have the key and key programmer follow the directions carefully and ensure the security light on your dashboard is turned ON prior to turning the engine ON You can contact a professional locksmith to help you if you are not sure about using a key programmer or if you have a car with more advanced features like remote head keys or intelligent keys Theyll have the appropriate tools and equipment to cut your blank key erase your previous one from the computer in the car and then program the new key to ensure that it will work correctly This will save you time and money and will ensure that your cars security system functioning just as it should Plus its a lot safer than trying to do it yourself If you use the wrong key programmer or follow unofficial guides or instructions the information stored in your cars system could be damaged and the new key wont work Remotes If your car keys dont work you may need to change the programming This is a straightforward process for many modern vehicles that have key fobs However certain models are more complex and must be programmed using an instrument that is available from a dealer or auto locksmiths Fortunately the majority of modern automobile manufacturers have made their key systems more secure in order to prevent theft of vehicles The key system is designed in a way to stop hotwiring which is using a key from a different vehicle to start the engine of your car To make this process work you will require at minimum two key fobs functioning for your vehicle Its essential to have at minimum two spare keys available The key fobs have electronic chips that transmit radio signals to the cars receiver The computer checks the keys code with the database If the codes match the car will start If not the vehicle will not start or fail to start Most electronic keys can be programmed and replaced by an experienced locksmith or dealer in the field with the right equipment If you can locate a cheap car key programmer on the internet or at an auto parts store the process should be fairly straightforward Youll need to follow a setup that includes inserting the ignition key and turning it on without starting the car and then switching off the key Youll need to repeat this procedure a specific number of times within a specified time period for your vehicle to enter programming mode The door locks will cycle or a chime will sound Certain modern vehicles are only programmable with a tool connected to the onboard diagnosis port or EEPROM programming Unfortunately the majority of these tools are incredibly expensive making them unaffordable for most car owners The majority of car experts recommend consulting an experienced auto dealer or locksmith to program your keys