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How to Replace a BMW Key The cost of replacing the BMW key could be expensive. BMW keys are high-tech, and require reprogramming to function with the vehicle. You can save money by purchasing a new BMW car key on the internet, but you need to find a vendor who specializes in car keys and has good reviews. It is also recommended to visit a dealer to ensure that your replacement is programmed correctly. Smart Keys Many new BMW models come with a smart-key system that allows you to lock and unlock your car with just a click on the steering wheel. Some models also have remote systems that allow you to start the engine and shut the windows and sunroof from a distance. These keys feature radio for locking / unlocking and infrared (IR) to communicate with the dashboard. The IR circuit powers a bidirectional infrared bridge that sends commands to and from the dashboard, and also to the receptacle in the key. The key is able to control the car even at a distance of few meters. The key has an RF coil which detects and transmits the remote lock signal from the car to the dashboard. These smart keys can also be used to save information such as power seat and mirror settings. To give access to someone else, you simply need to pair the key with an iPhone and then follow the directions on your device. This will enable you to provide them with an electronic key that can be used for as long as your phone is running and is within Bluetooth range. Modern smart keys, as opposed to older car key fobs that transmit the same frequency repeatedly (which could impact cars that use the same system, making it easier for cyber-savvy criminals to take cars) they transmit a different encrypted message each time they are used to open or shut the door or to open the trunk. The vehicle's embedded antennas then respond by generating a corresponding frequency in order to identify the key, and then unlock or start it. Smart key systems may be vulnerable to hacking however. An experienced professional can be able to take over IR transmissions and gain access to your vehicle. Always carry a backup key, or leave your smart key at home when you are going to go out to eat or shop. If you do lose your keys, be sure you keep the VIN number of your BMW and government ID available in case you have to obtain an exchange from the dealer. Key Fob Batteries The BMW key fob offers security and convenience with the click of a button. But, as with everything that is dependent on a battery the battery in the key fob will eventually die, often at the worst possible moment. It's easy to replace BMW key fob batteries. To replace the key fob's battery, open the fob at the seam connecting its two halves. The backplate of the fob is typically held in place by a notch that can be opened with either a finger or a flat-blade screwdriver. Once the backplate is removed, place a brand new button cell battery into the slot. The new battery will typically appear like a small coin, and will have plus and minus symbols printed on it. Insert the new battery in the same orientation as the previous one, then snap the fob's two halves back together. After replacing the battery Test it by pressing each of the fob's buttons to ensure they function as you expect. Based on the model, you could have to re-sync your key fob to your vehicle or take additional steps to make sure it functions correctly. If you have to update the sync of your key fob, consult the vehicle's owner manual for specific instructions specific to your BMW. A dead or weak battery on your key fob could reduce the range it communicates with your car, which can limit the ability to lock or unlock the doors or trunk, or arm or disarm your alarm system. It is time to replace the battery if you find yourself needing to get closer to your car to unlock the doors or start the engine. Change the battery of the key fob is a straightforward task that can be accomplished at home. After the battery has been replaced it is important to test the functions of the key fob by locking and unlocking the vehicle, or placing it in the ignition. After that, reassemble the key fob, and then test it again to ensure that it works properly. Understanding bmw replacement key G28 Car Keys when the batteries of the key fob need to be replaced and how to replace them, and how to start a vehicle with a dead battery will help you enjoy all of BMW's features. Slant Shaped Key Batteries If you're a BMW owner, then you take a lot of advantage of your car's keyless ignition and keyless entry features. These features make driving your BMW more enjoyable, and they can even assist you in avoiding some common automotive problems. If you don't pay attention to the signs that your BMW keyfob battery is low, it could quickly be out of charge. If your BMW key fob is damaged it's not capable of communicating with the vehicle's computer to unlock or start the engine. The battery in most BMW keys can be easily replaced. The procedure is easy and usually takes just an hour to complete. If you have an extra BMW key it's a good idea to keep it in your pocket so you can replace the battery when it's exhausted. The most important thing to remember when replacing a BMW key fob battery is to select the right replacement battery. The smart key requires a CR2450 while the sleek slant-shaped and Comfort Access fobs that were used in a variety of F series models from 2011 to 2017 require a CR2032 battery. Both kinds can be bought at many department stores and auto shops at a reasonable price. Another option is to get a replacement key for your BMW from a locksmith or dealership. These keys are laser-cut and coded by the vehicle's manufacturer to ensure compatibility with the keyless entry and start system. They are more expensive and take longer to arrive than the aftermarket ones. If you're looking to purchase an additional key for your BMW, consider using BimmerTech's easy online ordering process to save yourself time and money. Some drivers prefer using a smartphone as an “surrogate key” to start their BMW. Smartphones can be connected to your BMW's keyless entry and start system by using Bluetooth technology. This is particularly useful on hot summer days, when you don't wish to carry around a bulky BMW Key in your pocket. Valet Key Batteries Key fobs can be an excellent tool, but you might run out of batteries. This can make it difficult to lock your car and it could also prevent you from turning on the engine and drive. It is easy to replace the battery on the case of a BMW keyfob. The steps can vary slightly depending on the kind of key you have however, they're all very similar. The newer slant-shaped batteries for key batteries are simple to replace using a a simple process. You simply need to press the small tab that opens the inside of the valet key which is found on either the bottom or side of the fob. The battery can be removed by using a flat screwdriver. After you have removed the old battery, you can replace it with a brand new one. Then put everything back together. If you own an older diamond-shaped key with rechargeable batteries it could be more difficult to replace the battery. Unlike the slant-shaped keys, they are not intended to have the battery replaced. They can be damaged if you try to pry off the back plate of the key. You can force it open but you'll likely need to hire an expert. If you are looking to replace a battery that is old, it is recommended to contact an authorized dealer to have it done by a professional. BMW keys are available in different styles. Each of these key fobs has a specific driver profile, and you are able to connect them to different drivers in the vehicle. This makes it simpler for family members to share a vehicle, while still being capable of adjusting their driving experience. The most important thing to remember in this article is that you need to know what kind of key you own and how to replace it. This is essential if you want to ensure that your vehicle will be able to start when you push the buttons on your fob. This will help you avoid frustration if your key is not working properly, and it can also save you a lot of money if you're not forced to make a repair appointment at a dealership.