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How to Replace a Dead BMW Key Fob Nearly every BMW owner will need to replace their key fob battery at some point in time. Fortunately, this is very easy to do and won't cost you a lot. The key fob is powered by the standard CR2032 battery and can easily be repaired at a hardware store, online, or even an actual BMW dealership. Replacement Battery A lost or damaged key fob can be more than just an inconvenience; it could also be dangerous. You don't want to walk into your car, hit the unlock button, only to you find that there is no response. This is usually a sign that your BMW key fob battery has died. Luckily, this is easy to fix at home by using an alternative battery. The first step is to identify what kind of battery you BMW key fob needs – either an CR2450 (Smart Key) or a one of the CR2032 (Comfort Access/sleek slant-shaped keys). These batteries are available in auto parts and hardware shops for less than $5 per. Once you have the correct type of battery, all that is left to do is to replace the old battery and replace it with the new one. Be sure to close the two halves of the key fob securely after inserting the new battery. Remove the metal blade from the BMW key fob. Use a valet or flat screwdriver to remove it and reveal the small port at the back. Then, you can take it off the back and replace the batteries that are dead. Be careful not to break the plastic around the key fob when you remove it. Wrapping a small piece of tape over the top of your tool can help prevent any scratches. Once you have replaced the battery, you can now put back together your BMW key fob and test it. You have successfully reprogrammed the BMW key fob if your door locks and your vehicle starts. If not, you might have to refer to your owner's manual, or visit a dealer to get assistance. Key Blade If you've lost your key fob or just want to replace the battery, there are several places where you can purchase replacement BMW keys. Some online stores offer free shipping and reduced rates, making them a great alternative for drivers with a tight budget. It's important to remember that these prices don't include the cost to program the new key into your vehicle. Certain BMW models come with the “proximity key,” which allows you to start or unlock the car with the press of the button. Other models have a metal key hidden inside the remote, that needs to be placed into the ignition in order to start the engine. Both types of BMW keys are a bit different, but the procedure for replacing them is nearly identical. If the battery in your BMW key fob fails and you lose it, you won't be able to unlock your car or use Comfort Access if it is equipped. It's possible to replace the battery in a few simple steps. Make sure that the windows and doors of your vehicle are shut. Find the lock and unlock button on your working BMW Key Fob. Press and hold the unlock button until the electronic inside the key fob come on, but the engine remains off. Finally, insert the new battery into the key fob and then sync it within 30 seconds of syncing your original key. A large number of cars today including BMWs, are equipped with Smart Keys that can unlock and start the car without a traditional key. These keys have transponders that transmit a unique code to the immobilizer system of the car. This stops unauthorized key cloning or even starting. These keys are more costly than standard key fobs due to the fact that they require additional programming and a different technology. Some BMW models also have an extra feature, called Summon that lets you press a button on your key fob and get your car to come and take you away from the garage or parking lot. While this feature isn't available in all models, it's a powerful feature that could help you avoid having to call a taxi or fend off a creeper while trying to return your car. Start/Stop Button A brand new BMW key has an integrated push button that can start your car automatically. This feature could help you save time as it eliminates the need to remove your keychain from the car. However, there is a small amount of additional work in using the stop/start button on the replacement BMW key fob. The first step is to verify that the key fob is properly paired with your vehicle. Follow the instructions in this guide to do so. Once you have the correct key fob, it is time to program it to your BMW. The process for this will differ based on the kind of key you have. Some modern models come with keys with a display which can be programmed following the instructions in this guide. However older BMW models may require a visit to our dealership to get the key fob to be programmed. The process will begin by checking that the key fob has a working key blade. You can test this by inserting it into the keyhole, and pressing the lock/unlock buttons. If it works then the BMW iDrive system will ask you to assign a name on the key. You can then press the start/stop button in order to activate your vehicle. You will then need to schedule an appointment with Patrick BMW to program the new key fob. To confirm your identity, we will require a valid driver’s license and a copy the registration of your car. This information will allow us to identify the correct code for the key fob. Based on the model, you will either have an ordinary key fob that requires no programming, or an intelligent key fob with an integrated transponder that requires more sophisticated technology to program. Once the key fob is programmed, you will be capable of using it for your daily commute to Decatur. If you have lost your key fob you can contact our dealership for a repair that will deactivate the key fob's function in the system, and stop it from being used to unlock or start your vehicle. This is a great option to stop theft if are concerned that your keys might get into the wrong hands. Programming If your replacement BMW key fob comes with a brand new battery, but it's not working properly, you may require reprogramming it. The service team at our dealership in San Diego can help walk you through the steps for doing so. Start by inserting your working key into the ignition. Turn it quickly five times from zero to one. Next, take the key from the ignition and press the unlock button (the BMW logo) on the new key. Within 30 seconds press the BMW logo three times. Finally press the unlock button, and you should hear the doors automatically lock and unlock. The programming process for the replacement BMW keyfob is exactly same as the process for other BMW models. It should take less than 30 second to complete. Once you've finished you can start your engine and use the new key to start your car. It's important to replace your BMW key battery on a regular basis. It is recommended to replace your BMW key battery every month, at a minimum and based on the way you live. It's inexpensive and easy to change the key battery. why not try here is standard in size and you can find it in a majority of hardware stores, or in the parts department of the local dealership. BMW cars are a status symbol. It can make you feel like you have arrived in Longmont when you drive your BMW. However, BMW owners need to be aware that their expensive car can break down as any other. It's a good idea know how to program your BMW key fob before you ever require it. Our service department at Princeton will show you how to reprogram your BMW X3. One method is for when you have a working key, but need to add more keys or change it, while the other is to start from scratch without a working key.