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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 online, but you should locate a dealer who is an expert in car keys with good reviews. It is also recommended to visit the dealership to ensure that your new key is properly programmed. Smart Keys Today, many new BMW cars come with an intelligent key system that lets you lock and unlock your vehicle by simply pressing a button on the steering wheel. 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 or unlocking and infrared (IR) to communicate with the dashboard. The IR circuit is powered by a two-way infrared link that transmits and receives commands from the dashboard, and also to the receptacle in the key. This allows the key to control the car from just a couple of meters away. The key has an RF coil that receives and transmits the remote lock signal from the car to the dashboard. The smart keys can also save information such as the power seat and mirror settings. If you wish to share access to a person with whom you share access, all you need to do is connect the key with an iPhone and follow the prompts on your device. This will give them a key that works when their phone is in Bluetooth range. Unlike older car key fobs, which transmit the same frequency repeatedly (which could impact other makes and models utilizing the same system, and could making it easier for thieves with a tech background 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 in order to identify the key, and then unlock or turn it on. Hacking is possible but it isn't impossible. A skilled professional can take over IR transmissions and gain access to your vehicle. To ensure your safety, keep a backup key on hand or make sure to leave the smart key at home when you go out to eat or out shopping. If you do lose your keys, make sure to have the VIN number of your BMW and your government ID in case you have to obtain a replacement from the dealer. Key Fob Batteries The key fob is a crucial element of the BMW driving experience, offering security and convenience at the press of one button. However, like everything that is dependent on a battery the battery of the key fob can die-often at the most inconvenient time. It's easy to replace the BMW key fob's battery. To replace the key fob's battery, open the fob at the seam connecting its two halves. The fob's backplate is usually secured by a notch which can be opened with the fingers or a screwdriver with a flat blade. Place a brand new button-cell battery into its place after taking off the backplate. The new battery is typically shaped as a small coin and has plus and minus symbols on it. The new battery should be placed in the same way as the old one, then snap the fob's two halves together. After replacing the battery, test it by pressing each of the buttons on the fob to ensure they function as expected. Based on the model of your car you may need 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 sync the key fob. A dead or weak battery in your key fob may reduce the range the signal communicates with the car, limiting the ability to lock or open the trunk or doors or arm/disarm your alarm system. It is time to replace the battery if you discover that you must get closer to your car to unlock the doors or start the engine. Changing the key fob's battery is a simple task that can be accomplished at home. Once the battery is replaced, it's important to test the functions of the key fob by locking and unlocking the vehicle or putting it in the ignition. Then, you can reassemble the key fob and test again to ensure that it works correctly. By understanding when a key fob's battery requires replacement, knowing how to change the battery, and also how to start your car with a the battery of your key fob that is dead, you will be well on your way to taking advantage of the BMW's convenient and secure features. Slant Shaped Key Batteries BMW owners will likely benefit from the keyless entry system and ignition. These features can make driving your BMW easier and even help you to avoid some common automotive issues. However, if you aren't careful about the signs that your BMW key fob battery is getting low it will soon run out of juice. If your BMW key fob is dead it's not capable of communicating with the computer in your vehicle to unlock or start the engine. Fortunately, the battery in most BMW key fobs is replaceable cheaply. The procedure is simple and takes only about a minute. If you have a spare BMW key it's recommended to keep it in your pocket to ensure that you can swap the battery when it runs out of power. The most important thing to keep in mind when replacing the BMW key fob battery is to select the right type of replacement battery. A smart key will require the CR2450 battery, whereas the Comfort Access and sleek slant-shaped fobs that are used in many F-series models from 2011 until 2017 will require a CR2032 battery. Both are available in many auto shops as well in department stores for affordable prices. A locksmith or BMW dealership can also provide you with a replacement BMW key. These keys are laser-cut and coded by the vehicle's manufacturer to ensure compatibility with the keyless entry and start system. The drawback is that the keys are more expensive than replacement keys and can take longer to arrive. BimmerTech provides a simple online ordering system for BMW replacement keys. This will help you save time and money. While the most common way to start your BMW is to use the traditional key certain drivers prefer using their smartphones as a “surrogate” key. With 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 wish to carry an oversized BMW key around in your pocket. Valet Key Batteries A key fob is a useful device, but sometimes you may be unable to recharge your battery. This can make it difficult to lock your car and it can also prevent 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 vary a little depending on what kind of key you have however, they're all pretty similar. bmw key replacement cost -shaped key batteries are easy to replace with simple steps. Press the small tab to unlock the valet key. It is located on the bottom or the side of the fob. The battery can be removed by using a flat screwdriver. Once the old battery is removed, you can put in a new one and then put everything back together. It can be difficult to replace a battery on an older diamond-shaped key by rechargeable one. Contrary to the slant-shaped key, these are not designed to have the battery replaced. They can be damaged when trying to remove the back plate of the key. You may force it open, but you'll likely need to hire an expert. If you need to replace a battery that is old it is recommended to call a dealer to get it done properly. BMW keys come in many different styles. Each of these key fobs comes with a driver profile, and you are able to connect them to different drivers in the vehicle. This lets family members use the same vehicle while still being able customize their driving experience. The most important part of this article is that you need to know what kind of key you have and how to replace it. This is essential if you want to ensure that your vehicle will start when you push the buttons on your fob. This can help you avoid frustration if the key isn't working correctly, and it could also save you lots of money if you are not forced to make a repair appointment at an auto dealership.