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How to Replace a Dead BMW Key Fob Almost every BMW owner will need to replace their key fob's battery at some point in time. This is a easy task that doesn't cost a fortune. The key fob is powered by a standard CR2032 and can be replaced at a local BMW dealer, online or in an hardware store. 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 go into your car, hit the unlocking button, and then discover that there is no response. This usually means that the battery in your BMW key fob has gone out of service. It is a simple fix that you can do at home with a brand new battery. The first step is to identify the type of battery you BMW key fob requires either a CR2450 (Smart Key) or a C2032 (Comfort Access/sleek slant shaped keys). These batteries are available in hardware and auto parts shops for less than $5 each. Once you have the proper type of battery, it's simple to swap out the old battery with the new one. Be sure to close the two halves of the key fob securely once you have inserted the new battery. Remove the metal blade from the BMW key fob. Utilize a valet or flat screwdriver to take it off and reveal the tiny port on the back. Then, you can pop off the back and replace the dead batteries. Be careful not to break the plastic surrounding the key fob when removing it. Wrapping a small piece tape over the top of your tool can help prevent any scratches. After replacing the battery you must reassemble and check your BMW key fob. You have successfully reprogrammed your BMW key fob, if your door locks and your car starts. If you are not able to do that then you must go through the owner's manual for your car or visit an BMW dealer for assistance. Key Blade There are many places to buy replacement BMW keys, whether you've lost the key fob or want to replace your battery. Some online retailers offer free shipping and discounted rates, making them a great alternative for those who are budget-conscious. However, it is important to remember that these prices do not include the cost of programming the new key into your vehicle. Some BMW models come with a “proximity-key” that allows the user to start or unlock the vehicle by pressing the button. Other models have a metal key hidden inside the remote, that needs to be put into the ignition to start the engine. Both kinds of BMW keys are a little different, but the process to replace them is almost identical. If the battery inside your BMW key fob fails, you will not be able to unlock your car or use Comfort Access if it is equipped. Fortunately, it's possible to replace the battery in a few simple steps. Ensure that the doors and windows of your vehicle are shut. Find the lock and unlock button on your working BMW Key Fob. Press and hold the lock button until you see the electronics inside the key fob come on, but the engine stays off. Finally, insert the new battery into the key fob, and sync it within 30 seconds of synchronizing your original key. previous of modern cars, including BMWs are equipped with Smart Keys that can unlock and start the car without a traditional key. These keys are equipped with transponders, which transmit an individual code to the immobilizer system in the car. This blocks unauthorized key-cloning or even starting. They are more expensive than standard key fobs as they require additional technology and programming. Some BMW models also come with an exclusive feature known as Summon that lets you press a button on your key fob and then get your car to come and take you away from an area of parking or garage. This feature isn't offered on all models, however it is a great function that can help you avoid having a taxi arrive to pick up your car, or fighting off a creeper to return it. Start/Stop Button The latest BMW key comes with an inbuilt push button which will start your car for you. This feature is a great option to save time and avoid having to leave the car to get your keychain. However, there is a bit of extra work involved in using the stop/start button on a replacement BMW key fob. The first step is to make sure that the key fob is properly paired with your vehicle. This can be accomplished by following the steps in this guide. It is now time to set up the key fob for your BMW. The process may differ according to the type of key you have. This guide will teach you how to program a display keyfob for certain modern models. Older BMW models may require to be brought to our dealership to be programmed with the key fob. Check whether the key blade on the new key fob is functioning. You can test this by placing it into the keyhole, and pressing the lock/unlock buttons. If it works it will be displayed on the BMW iDrive system will ask you to assign a name to the key. You can then press the start/stop button to start your vehicle. Next, you will need to set up an appointment with Patrick BMW to have the new key fob programmed. We will require a valid driver's license to confirm your identity, as well as an official copy of your vehicle's registration. This will enable us to determine the code required for your key fob. You will either have a standard key fob that does not require programming, or a key fob smart equipped with a transponder that requires more advanced technology. Once the key fob has been programmed, you can start using it to commute every day along the Decatur roads. If you lose your key fob, you can also contact our dealership for a service that will disable the key fob within the system and prevent it from being used to unlock or start your car. If you're worried that your keys could be stolen this is a great solution to stop theft. Programming You may need to re-programme your replacement BMW keyfob in case it has an upgraded battery, but does not function properly. Our service team in San Diego will guide you through the procedure. Begin by inserting the working key into the ignition. Turn it five times quickly from position zero to position one. Then remove the key from the ignition and press the unlock button (the BMW Logo) on the new keys. Within 30 seconds, press the BMW logo three times. Finally release the unlock button, and you will be able to hear the doors locking automatically and unlock. The process of programming a replacement BMW key fob is the same for other BMW models, and can be completed in less than 30 minutes. After you've completed the process you can start your engine and use the new key to start your car. It's important to replace your BMW key battery frequently. You should do so once a year, or every two months based on your lifestyle. It is cheap and easy to change the battery on your key. The BMW key battery is available in the standard size and can be found at most hardware stores, or in the parts department of local dealerships. Being the owner of a BMW vehicle is a sign of status and it feels like you've arrived travel through the streets of Longmont in your BMW. However, BMW owners need to be aware that their expensive car can break down just like any other. It is recommended to learn how to program a BMW remote control prior to when you'll need it. Our service department at Princeton can help you learn how to reprogram your BMW X3. The first is if you already have a key that works and want to add another or the other the case if you're starting from scratch and do not have an existing key.