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Troubleshooting Problems With BMW Keys BMW keys were large black plastic rectangles They were inserted into the ignition to begin and unlock the car But that all changed when the digital keys came out But is it possible to hack And can you use a keyfob that isnt genuine to enable Comfort Access in your BMW Keyless entry If youve been driving a BMW car for a while you are probably familiar with remote start and keyless entry These features are convenient and can make driving safer You can lock and unlock your car from the comfort of your home if youve got the right apps on your smartphone However just like any other new technology key fobs these key fobs come with certain quirks that can be confusing Some BMW owners wonder about for example whether their key fobs can be stolen BMWs are designed with security in mind and therefore theyre virtually impossible to hack The system is based on sending a distinct identifying signal from your key fob to your car which is verified and allowed to unlock This means that a third party cannot clone or use a signal amplifier to gain access to your vehicle The BMW fob is often put to sleep If the fob isnt used for a certain amount of time it will go into sleep This is to conserve battery power and prevent the car from opening when its not supposed to However the key fob can function in the ignition when its pressed again The BMW key fob in addition to keyless entry is able to lock and unlock a vehicle or enable automatic transmission on cars that have manual shifting The BMW key fob can also control features of comfort such as the steering wheel seat and mirror adjustments It can also store personal settings such as presets for radio seat position and other functions BMW key fobs can also be used to unlock a trunk or to trigger a pushbutton starter on some models To do this simply press the button at the bottom of the fob until it sounds Then insert bmw replacement keys thekeylabcouk into the trunk opener and pull it down to unlock the trunk The BMW key fob can also control the vehicles climate control and media system Electronic immobilizer The engine immobilizer a security feature helps prevent car thefts by ensuring that only the correct key can be used to start the car It does this by verifying that the keys code is identical to the one stored in the computer The engine will only start only if the codes match This system has been in use for over 20 years and has been able to decrease the theft of vehicles Its also a great method to avoid hotwiring which is the process of bypassing the ignition switch by connecting wires between the ignition coil and the fuel pump relay The immobilizer is part a key fob or key that has a transponder The chip transmits a code to the immobilizer unit of the car which is built into the PCM BCM instrument cluster smart junction box or any other module The immobilizer device then validates the passcode and allows the engine to start if the passcode is right Modern transponder chips and keys utilize a cryptographic algorithm in order to ensure that the code is only transmitted once and only to the authorized key fob or key These algorithms are designed to be difficult for hackers to crack This technology also protects against key duplicates that are remote which is common in the instance of stolen vehicles It will sound an alert when it is unable to recognize the code on the key or the key fob It will also disable the ignition coil or injectors dependent on the type of engine that is in your car The engine will turn on for a short period of time and then shut down making it impossible to drive the vehicle away An immobilizer is a great security feature and has helped to reduce theft of vehicles by preventing hot wiring However its not foolproof and many thieves have come up with ways to thwart the immobilizer Some of these strategies include using a laptop to decode the cryptographic algorithm which is possible using an application that is specifically designed for this purpose A device can be used to alter the code of the key or the transponder chip This can be accomplished by using a device known astransponder reader or transponder reader which is available online for purchase These tools dont always work however they can be useful in some cases Replace the battery If your BMW key fob isnt functioning as well as it used to you may need an upgrade to the battery Fortunately replacing the battery in your BMW is a simple procedure that shouldnt take more than 30 minutes The first step is to remove the metal key from the fob Then press the key into a deeper section to release the back of the fob Then take out the batteries that were in use and replace them with new ones You can find CR2450 Batteries in a majority of petrol stations and supermarkets There are various ways to replace the battery based on the type BMW key you have For instance if you are using the BMW Smart Key it utilizes a rechargeable battery which charges when it is inserted into ignition The battery cant be replaced without cutting the case Youll need to call your local BMW dealer Many BMW models between 2011 and 2017 feature an elegant slantshaped battery which is also known as a watch battery The battery can be replaced by pressing an option near where the key flips out of the case before removing it A small groove inside this opening will show up and you can utilize a valet keys or screwdriver to turn the groove clockwise in order to remove the cover After the cover is removed you can take off the dead battery and put in a new one The range of the signal on your BMW key fob will usually decrease when the battery is failing It should be possible to unlock your car from a distance between 30 to 60 feet If you cant get more than 20 feet away the time is now to change the battery A damaged or depleted battery will also stop the remote starter from working This is a crucial security feature in a lot of vehicles so it is important to change the battery as soon as you can If you own a BMW equipped with a push button start youll have to go to the dealership to program the new key fob and sync additional fobs to the vehicle Replace the key BMW is a luxury automobile manufacturer that provides an array of models each with different features These vehicles are popular for their style comfort and performance However sometimes even a luxury vehicle may be a problem A common problem is the key fob It could shut down at any time This can be a very difficult experience particularly when you have to go to a location To address this issue the best thing to do is replace the battery on your BMW key fob Its a simple process that can be done at home The only issue with this process is that it can take a bit of time To make the process more simple you can order an additional key and fob online from a business that specialises in BMW keys You will not need to wait in the line at the dealership to get an alternative key BMW key fobs come in different styles based on the model The most recent ones utilize Smart Keys which is a device that is modern and can secure your car and unlock it They are typically more robust than older BMW keys however the battery must be changed when it dies Older BMWs that are being parked in Decatur may use a Bladed Key or a Non Comfort Access Key The Bladed Key uses a metal key that is inserted into the ignition lock The NonComfort Access Keys which were in use between 1996 and 2011 on some X3 E83 models have a key with a side indent which isnt removable Youll need a screwdriver to remove the dead battery from this kind of key Then place the new battery into the clip or holder Be careful not to scratch the circuit board or plastic of the keyfob Once you have the new battery then you can turn the metal key to position 1 and insert it into the ignition The lights and other accessories should activate and the car should start If this doesnt work you may have to repeat the procedure