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How to Replace a BMW Key Replacement of a BMW key is costly. BMW keys are highly-technical, and need to be reprogrammed in order to work with the vehicle. You can save money by purchasing a new BMW car key on the internet, but you need to locate a dealer who specializes in car keys that has excellent reviews. It's also recommended that you visit a dealership to make sure that your replacement is properly programmed. Smart Keys A lot of new BMW models are equipped with a smart-key system that allows you to unlock and lock your vehicle with just a click on the steering wheel. Some models also have a remote system that allows you to start the engine and shut the sunroof and windows from a distance. These keys feature radio for locking or unlocking and infrared (IR) to communicate with the dashboard. The IR circuit is the source of a bidirectional infrared bridge that sends commands from and to the dashboard and to the receptacle in the key. This lets the key control the car from just a few meters away. The key also features an RF coil that detects the car's remote lock signal and transmits it to the dashboard. These smart keys can also be used to store information like power seat and mirror settings. To share access with someone, you need to connect the key to an iPhone and then follow the directions on your device. This will enable you to give them a digital key that will work for as long as your phone is running and within Bluetooth range. Modern smart keys, unlike older key fobs for cars that transmit the same frequency repeatedly (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're used to open or shut a door or pop out the trunk. The vehicle's embedded antennas then respond by generating a corresponding frequency to recognize the key and allow it to unlock or turn it on. Hacking is possible, but not impossible. A skilled professional can intercept IR transmissions to gain access to your car. Always keep a spare key in your vehicle, or leave your smart key at home if are going to eat out or shop. If you do lose your keys, make sure to have the VIN number of your BMW and your government ID in case you need to obtain an exchange from the dealer. Key Fob Batteries The key fob is an important element of the BMW driving experience, offering convenience and security at the press of a button. The battery of the key fob could also go out of service, as with anything that is powered by batteries. This happens at the worst time. Fortunately the replacement of a BMW key fob's battery is easy and quick. Open the fob along the seam that joins the two halves. The fob's backplate is secured by a the notch that can be opened with an screwdriver with a flat blade or a finger. Once the backplate is removed, you can insert a new button cell battery in its place. The new battery is typically shaped as a small coin and has plus and minus symbols printed on it. Place 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 buttons on the fob to ensure they function as expected. Depending on the model, you could have to re-sync your key fob to your vehicle or take additional steps to ensure that it functions properly. If you have to re-sync your key fob, consult the vehicle's owner manual for specific instructions specific to your BMW. A weak or dead battery in your key fob can limit the range at which it communicates with your car, which can limit the ability to lock or open the doors or trunk, or arm/disarm the alarm system. If you're finding that you need to step closer and closer to your vehicle to get the key fob to unlock or start the engine, it is likely time to replace the battery. It's simple to replace the battery in your key fob at home. After replacing the battery, it's important to verify the function of the key fob by locking and unlocking the vehicle or placing it in the ignition. Reassemble the keyfob, and test it once more to ensure that it's functioning properly. By knowing the time when a key fob's battery must be replaced and how to replace the battery, and how to start your vehicle with the battery of your key fob that is dead you'll be on your way to taking advantage of the BMW's convenience and secure features. Slant Shaped Key Batteries If you're a BMW owner, you probably take a lot of advantage of the keyless ignition and entry features. These features make driving your BMW much more comfortable, and they can even aid you in avoiding common automotive problems. If you're not aware of the signs that your BMW key fob battery is dwindling, it can quickly run out of juice. If your BMW key fob is dead and is no longer able to communicate with the computer in your vehicle to unlock or start the engine. The batteries that are found in many BMW keys can be easily replaced. The process is simple and takes only about a minute. Keep an extra BMW in your pocket to replace the battery when it runs out. The most important thing to remember when changing the BMW key fob battery is to choose the right replacement battery. A smart key requires a CR2450 battery, while the Comfort Access and sleek slant-shaped fobs that are used in a variety of F-series models between 2011 and 2017 will require the CR2032 type of battery. Both types are available at many auto shops as well as department stores at a reasonable price. Another option is to purchase a replacement key for your BMW from a locksmith or dealership. The keys are laser cut and digitized by car manufacturers to ensure compatibility with keyless entry and starting systems. The disadvantage is that they are more expensive than replacement keys and can take longer to arrive. BimmerTech provides a simple 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 using a traditional key however, some drivers prefer to use their smartphones as a “surrogate” key. Smartphones can be connected to the keyless entry and start system by using Bluetooth technology. This is especially helpful during hot weather and when you don't want to carry around a heavy BMW Key in your pocket. Valet Key Batteries A key fob can be an effective tool, however you may sometimes 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 simple to replace the battery on a BMW keyfob. The steps will differ based on the kind of key, but they're fairly similar. The newer slant-shaped key batteries are easy to replace through a an easy process. You just 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 is accessible by using a flat screwdriver. Once the old battery is removed, you can put in a new one and then put it back together. If you own an older, diamond-shaped key that uses rechargeable batteries it could be more difficult to replace the battery. The keys are not intended to be replaced with a battery, and can be damaged if you try to pry the backplate off. You may force it open, but you'll likely need to hire a professional. If you need to replace an old battery it is recommended that you contact an authorized dealer to have it done by a professional. Another thing to take into consideration is that there are many different kinds of BMW keys available. Each of these key fobs has its own driver profile, and you are able to connect them to different drivers in your vehicle. Main Page allows family members to use the same vehicle and still be able to customize their driving experience. This is the most important part because you must be aware of the kind of key you have and how to replace it. This is crucial if you want to ensure that your car will be able to start when you press the buttons on your fob. This will help you avoid frustration when the key isn't working properly, and it can also save you a significant amount of money since you're not required to pay for a service appointment at an auto dealership.