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How to Replace a BMW Key Replacement of the BMW key is expensive. BMW keys are high-tech and need to be reprogrammed in order to work with the vehicle. Purchasing a new BMW key online could save you money, but it is essential to choose an online retailer that is specialized in car keys and has positive reviews. It's also recommended that you visit a dealership to make sure that the replacement key is programmed correctly. Smart Keys Today, many new BMW models come with an intelligent key system that allows you to lock and unlock your vehicle with a simple click of a button on the steering wheel. Certain models also come with remote systems that allow you to start the engine and shut the sunroof and windows from an extended distance. These keys are advanced and use radio for locking or unlocking and infrared (IR) to communicate with the dashboard. The IR circuit powers a two-way infrared link which transmits commands from and to the dashboard, and also to the receptacle in the key. This allows the key to control the car from a few meters away. The key also comes with an RF coil that detects the car's remote lock signal and transmits it to the dashboard. These smart keys can also save information such as power seat and mirror settings. If you wish to share access with a friend, all you need to do is connect the key to an iPhone and follow the instructions on your device. This will give them a key that is working as long as their phone is connected and within Bluetooth range. Modern smart keys, in contrast to older key fobs for cars that broadcast the same frequency over and over again (which could impact cars that use the same system, making it easier for tech-savvy criminals to take cars), broadcast a different encrypted message each time they are used to open or shut doors or open the trunk. The antennas in the vehicle respond by generating a corresponding frequency to identify the key and unlock or turn it on. Smart key systems could be vulnerable to hacking, however. An experienced professional can be able to be able to intercept IR transmissions and gain access to your vehicle. To ensure your safety, keep a backup key in your vehicle or ensure that you leave the smart keys at home when you go out to eat or out shopping. If you lose your keys, be sure to keep the VIN number of your BMW and your government ID in case you have to request a replacement from a dealer. Key Fob Batteries The key fob is an essential element of the BMW driving experience, offering security and convenience by pressing a button. However, like everything that relies on a battery, the key fob's battery will eventually die, often at the worst possible moment. Fortunately the replacement of the battery of a BMW key fob's battery is simple and quick. To replace the battery in the key fob open the fob in the seam connecting its two halves. The fob's backplate is held in place by a an opening that can be opened using an screwdriver with a flat blade or a finger. After the backplate is removed, insert a new button cell battery into the slot. The new battery is usually shaped as a small coin and has plus and minus symbols printed on it. Place the new battery in the same orientation as the old one, and then snap the fob's two halves together. After replacing the battery on the key fob Press each button to test whether it functions as you expect. Based on the model, you may need to reconnect your key fob to your vehicle or take additional steps to make sure it works correctly. Consult the owner's manual of your BMW for specific instructions on how to sync the key fob. A weak or dead battery for the key fob could reduce the range of the signal that connects with your car, which can limit its ability to lock and unlock doors and trunk as well as arm or disarm the alarm system. If you are noticing that you need to step 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. Changing the key fob's battery is a simple job that can be accomplished at home. After replacing the battery, you should check the functionality of the keyfob by locking and unlocking your vehicle, or placing it in the ignition. Reassemble the keyfob and then test it again to make sure that it's working as intended. Knowing what happens when the batteries on the key fob need to be changed and how to replace them, and how to start a car with a dead battery will allow you to take advantage of all of BMW's useful features. Slant Shaped Key Batteries BMW owners will likely make the most of the keyless entry system and ignition. These conveniences make driving your BMW more enjoyable and could assist you in avoiding some common automotive problems. If you aren't paying attention to the indicators that your BMW keyfob battery is low, it could quickly be out of charge. If your BMW key fob is damaged, it can't communicate with the car computer to unlock the doors or even start the motor. Fortunately, the battery in the majority of BMW key fobs is replaceable inexpensively. The process is easy and takes only minutes. Keep a spare BMW in your pocket to charge the battery if it runs out. The most important thing to keep in mind when replacing the BMW key fob battery is to choose the right replacement battery. The smart key requires a CR2450 as do the sleek slant-shaped, slant-shaped Comfort Access fobs used in many F series models from 2011 until 2017 require a CR2032 battery. Both are available in most auto shops as well as department stores at a reasonable price. A locksmith or BMW dealership can also supply you with the replacement BMW key. These keys are laser cut and coded by the car manufacturers to ensure compatibility with keyless entry and start systems. These keys are more expensive and take longer to arrive than aftermarket versions. BimmerTech provides a user-friendly online ordering system for BMW keys replacement. This will save you time and money. While the most commonly used method to start your BMW is with the traditional key however, some drivers prefer to use their smartphones as a “surrogate” key. Through bmw replacement key fob , your smartphone can connect to the keyless entry and start system. This is especially useful during hot weather in the summer, when you don't want to carry around a heavy BMW Key in your pocket. Valet Key Batteries Key fobs can be a useful tool, but you may sometimes run out of batteries. This can make it difficult to lock your car, and also stop you from turning on the engine and drive. Fortunately, changing a BMW key fob battery isn't too difficult and can be done at home. The steps may differ a little depending on what kind of key you own however, they're all fairly similar. The newer slant-shaped key batteries are simple to replace using a an easy process. Press the small tab to let the valet key go. This can be found on the bottom or side of the fob. The battery is accessible by using a flat screwdriver. After you've removed the old battery, you can replace it with a brand new one. Then put everything back together. It can be difficult to replace a battery on an older diamond-shaped key with rechargeable ones. These keys are not designed to be replaced using a battery, and can be damaged if you attempt to remove the backplate. You can try to open it but you'll need a professional to do this. It is recommended that if you need to replace the battery, you contact an auto dealer for help from a professional. Another thing to consider is the fact that there are a variety of different types of BMW keys that are available. Each of these key fobs has a specific driver profile, and you are able to pair them to different drivers in your vehicle. This allows family members to use the same vehicle and still be able to customize their driving experience. This is the most important part since you need to know which kind of key you have and how to replace it. This is essential if you want to ensure that your vehicle can start when you press the buttons on your fob. This will help you avoid frustration if the key is not working correctly, and it could also save you lots of money since you're not required to pay for a service appointment at an auto dealership.