How to Replace a BMW Key

The cost of replacing the BMW key can be expensive. BMW keys are high-tech, and need to be reprogrammed to function with the vehicle.

Purchasing a new BMW key online can save you money, but it is important to find a vendor that specializes in car keys and has good reviews. It is also recommended to visit the dealership to make sure the replacement key is properly programmed.

Smart Keys

Today, many of the latest BMW cars come with a smart key system that allows you to lock and unlock your vehicle with a simple click of an icon on the steering wheel. Some models also come with a system that lets you start the engine from a distance, and also remotely close the windows and sunroof. These advanced keys use radio to lock / unlock, and infrared to connect with dashboard.

The IR circuit is powered by a two-way infrared link that transmits and receives commands from the dashboard, as well as to the receptacle inside the key. The key is able to control the car from a distance of a few metres. The key also comes with an RF coil that picks up the remote lock signal of the car and transmits it to the dashboard.

These smart keys can also save information such as power seat and mirror settings. To give access to someone else, you just need to pair the key with an iPhone and then follow the instructions on your device. This will allow you to provide them with the key digitally and it will work as long as the phone is turned on and in Bluetooth range.

In contrast to older key fobs that transmit the same frequency repeatedly (which could be affecting other models and makes using the same system, not to mention makes it easier for tech-savvy thieves to take vehicles) Modern smart keys emit a distinct encrypted signal every time they're used to open or close a door or pop the trunk. The radio antennas in the vehicle respond by creating the corresponding frequency to identify the key, unlock or start it.

Smart key systems can still be vulnerable to hacking however. An experienced professional can be able to intercept the IR transmissions and gain access to your vehicle. Always have a backup key or leave your smart key at home if you are going to go out to eat or shop. If you lose your keys, make sure to have the VIN number of your BMW and government ID available in case you need to obtain a replacement from the dealer.

Key Fob Batteries

The BMW key fob offers convenience and security with the push of a single button. But, just like anything that relies on batteries, the key fob's battery can die-often at the worst possible time. It's simple to replace the BMW key fob's battery.

To replace the battery in the key fob open the fob in the seam that joins its two halves. The backplate of the fob is typically fixed by a notch which can be opened with a finger or a screwdriver with a flat blade. After the backplate has been removed, place a brand new button cell battery in its place. The new battery will typically look like a small coin and will have plus and minus marks printed on it. Inject the new battery into the fob in the same way as you did with the old battery and then connect the two halves.

After replacing the battery Test it by pressing each of the buttons on the fob to make sure they function as expected. Based on the model you have, you may need to re-sync the key fob with your vehicle or follow other steps to ensure proper function. If you're required to re-sync your key fob, consult the vehicle's owner manual for the specific instructions applicable to your BMW.

A dead or weak battery in your key fob may limit the range at which it communicates with your vehicle, limiting its ability to lock or open the trunk or doors or arm/disarm the alarm system. It is time to replace the battery if you notice that you need to move closer to your car to unlock the doors or start the engine.


It's easy to replace the battery inside your key fob at home. After replacing the battery, it's important to test the key fob's functions by locking and unlocking the vehicle or placing it in the ignition. Then, reassemble the key fob and run a test to ensure it works properly. Understanding the time when the batteries of the key fob need to be changed, how to replace them, and how to start a car without a battery that is dead will help you enjoy all of BMW's useful features.

Slant Shaped Key Batteries

BMW owners probably benefit from the keyless entry system and ignition. These features make driving your BMW much more comfortable, and they can even help you avoid some common car issues. If you're not attentive to the indicators that your BMW key fob battery is getting low it could quickly run out of juice.

If your BMW key fob fails to function, it can't communicate with the computer in the vehicle to unlock the doors or start the motor. Fortunately, the batteries in the majority of BMW key fobs can be replaced relatively cost-effectively. The process is straightforward and typically takes only an hour to complete. If you have an extra BMW key it's recommended to keep it in your pocket so that you can swap the battery as soon as it's exhausted.

When replacing the BMW keyfob battery, it is crucial to select the right type of battery. The smart key requires a CR2450, as do the sleek slant-shaped, slant-shaped Comfort Access fobs that were used in a variety of F series models from 2011 until 2017 require a CR2032 battery. Both are available in many auto shops as well as department stores at an affordable price.

A locksmith or BMW dealership can also supply you with the 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 the ones from the aftermarket and may take longer to arrive. If you're interested in getting an additional key for your BMW you should consider BimmerTech's easy online ordering process to save time and money.

While the most commonly used method to start your BMW is with keys that are traditional however, some drivers prefer using their smartphones as an "surrogate" key. Smartphones can be connected to the keyless start and entry system via Bluetooth technology. This is particularly useful on hot days and when you don't want to carry a heavy BMW Key in your pocket.

Valet Key Batteries

A key fob can be a useful tool, but it is possible to run out of batteries. This could make it difficult to lock your car and also prevent you from being able to start the engine. Fortunately, changing a BMW key fob battery isn't too difficult and can be done at home. The steps will differ based on the kind of key, but they're all pretty similar.

The newer slant-shaped batteries for key batteries are simple to replace using a simple steps. Simply press the small tab to release the inside of the valet key located on the bottom or side of the fob. You can then employ a flat screwdriver to remove the access port which is hidden by the battery. After the old battery has been removed, you can insert the new one and put it back together.

It can be difficult to replace a battery on the older diamond-shaped keys with a rechargeable one. Unlike the slant-shaped keys, they aren't designed to be replaced. here are the findings could be damaged when trying to remove the back plate of the key. You can attempt to force it open however, you'll require the assistance of a professional for doing the job. It is recommended that if you have to replace the battery, you contact a dealership for professional help.

BMW keys are available in different styles. Each of these key fobs comes with a driver profile, and you can pair them with different drivers in the vehicle. This allows family members to share the same vehicle, and still be able to customize their driving experience.

This article is most important because you must know which kind of key you have and how to replace that key. This is essential if you want to ensure that your vehicle will start when you press the buttons on your fob. This can help you avoid frustration if your key isn't functioning properly, and it can also save you a significant amount of money if you are not forced to pay for a service appointment at a dealership.