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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 need to be reprogrammed to function with the vehicle. You can save money by purchasing a brand new BMW car key online, but you should find a vendor who is specialized in car keys that has excellent reviews. It is also recommended to visit the dealership to make sure that your new key is properly programmed. Smart Keys A lot of new BMW models come with a smart-key system that lets you unlock and lock your vehicle by simply turning the steering wheel. In addition, some models also come with a system that lets you start the engine from a distance and also remotely shut the windows and sunroof. These keys feature radio for locking / unlocking and infrared (IR) to communicate with the dashboard. The IR circuit is the source of an infrared bridge bidirectional that sends commands from and to the dashboard as well as to the receptacle in the key. This lets the key control the car from a couple of meters away. The key has an RF coil that detects and transmits the remote lock signal from the car to the dashboard. These smart keys can also be used to store information such as mirror and power seat settings. If you'd like to share access with a friend all you have to do is connect the key with an iPhone and follow the instructions on your device. This will allow you to share a digital key that can be used as long as the phone is turned on and is within Bluetooth range. Contrary to older key fobs for cars, which transmit the same frequency repeatedly (which could be affecting other models and makes using the same system, not to mention make it easier for tech-savvy thieves to take vehicles), modern smart keys transmit a distinct encrypted signal each time they're used to open or close a door, or pop the trunk. The antennas in the vehicle respond by generating a corresponding frequency to recognize the key and allow it to unlock or open it. Hacking is possible but not impossible. A skilled professional can intercept the IR transmissions and gain access to your vehicle. Always keep a spare key in your vehicle, or leave your smart key at home if plan to go out to eat or shop. If you lose your keys, make sure to have your VIN number and ID from the government handy in case you need a replacement. Key Fob Batteries The key fob is an important element of the BMW driving experience, offering security and convenience with the push of one button. But, as with everything that relies on a battery the battery of the key fob will eventually die, often at the worst possible moment. spare bmw key to replace BMW key fob's battery. Open the fob along the line which connects the two halves. The backplate of the fob is typically fixed by a notch that can be opened using a finger or a flat-blade screwdriver. Insert a new button-cell battery into its place after taking off the backplate. The new battery is typically shaped like a small coin with plus and minus symbols printed on it. Place the new battery inside the fob in the same orientation that you used to insert the old battery and then snap the two halves together. After replacing the battery on the key fob, press each button to verify that it is working as expected. Based on the model you have you may have to re-synchronize the key fob with your vehicle or follow other steps to ensure proper operation. Refer to the owner's guide of your BMW for specific instructions on how to re-sync the key fob. A weak or dead battery for the key fob could reduce the range of the signal it transmits with your car, limiting its ability to lock and unlock the doors and trunk and arm/disarm the alarm system. If you notice that you are required to stand closer and closer to your vehicle to unlock the key fob, or unlock or start your engine, it is likely time to replace the battery. The battery replacement for the key fob is a straightforward task that can be completed at home. After replacing the battery, you should test the function of the keyfob by locking and unlocking your vehicle or placing it in the ignition. Reassemble the keyfob, and test it again to confirm that it is working properly. By understanding the time when a key fob's battery must be replaced and knowing how to replace the battery, and also how to start your car with a the battery of your key fob that is dead you'll be on your way to enjoying the BMW's convenient and secure features. Slant Shaped Key Batteries If you're a BMW owner, then you take a lot of advantage of the keyless ignition and entry features. These features can make driving your BMW more comfortable and may even assist you avoid common automotive issues. If you don't pay attention to the signs that your BMW keyfob battery is running low, it could quickly run out. If your BMW key fob dies, it can't communicate with the vehicle computer to open the doors or even start the motor. The batteries in the majority of BMW keys can be easily replaced. The process is straightforward and typically takes only a few minutes to complete. If you have a spare BMW key it's an ideal idea to keep it in your pocket so you can replace the battery if it is depleted of power. The most important thing to keep in mind when changing a BMW key fob battery is to use the right type of replacement battery. The smart key requires a CR2450 while the sleek slant-shaped and Comfort Access fobs, which were available in various F series models from 2011 to 2017 require a CR2032 battery. Both are available in many auto shops as well in department stores for a reasonable price. Another option is to purchase a replacement key for your BMW from an authorized locksmith or dealer. The keys are laser cut and digitized by the car manufacturers to ensure compatibility with keyless entry and start systems. The drawback is that they are more expensive than the ones from the aftermarket and may take longer to arrive. If you're considering purchasing a replacement key for your BMW, consider using BimmerTech's online ordering system to save time and money. Some drivers prefer to use smartphones as an “surrogate key” to start their BMW. By using Bluetooth technology smartphones can connect to your BMW's keyless entry and start system. This can be particularly useful on hot days when you don't want to carry a heavy BMW key around in your pocket. Valet Key Batteries Key fobs are extremely useful tool however, sometimes you might run out of battery power. This can make it difficult to lock your car and also stop you from being able to turn on the engine and drive. Luckily, replacing a BMW key fob battery isn't too difficult and can be done at home. The steps may vary depending on the type of key, but they're fairly similar. It is simple to replace the newer key batteries that have a slant shape with a simple procedure. Press the small tab to release the valet key. It can be found on the bottom or the side of the fob. Then, you can employ a flat screwdriver to remove the access port that is hidden by the battery. After you have removed the old battery and replacing it with a new one. Then put everything back together. It can be a challenge to replace a battery on an older diamond-shaped key with rechargeable ones. In contrast to the slant-shaped keys these are not intended to have the battery replaced. They can be damaged if you try to remove the back plate of the key. You may force it open, but you'll probably need the help of a professional. It is advised that if you require to replace a battery, you contact an auto dealer for help from a professional. Another thing to take into consideration is that there are different types of BMW keys that are available. Each of these key fobs comes with a driver profile, and you can connect them to various drivers in the vehicle. This makes it easier for family members to share a single car, while still being in a position to personalize their driving experience. This is a crucial article since you need to be aware of the type of key you own and how to replace it. This is essential if you want to ensure that your vehicle will start when you press the buttons on your fob. You can save yourself frustration and money by not needing to pay for an appointment with the dealership when your key doesn't perform as expected.