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Changing the Battery in Your Mini Key Fob

The key fob makes it easy to lock and unlock your vehicle from a distance. It also allows you to activate your car's panic button that can stop burglaries.

You can fix your device by following a few simple steps. Make sure that the battery is brand new. Then, you can try removing it from the ignition and pressing the lock button three times quickly.

Battery

The most straightforward way to repair the battery of your key fob is to replace it. The fob uses the small coin-shaped battery (CR2032, 2025) and can be located in the majority of general stores or home improvement stores and auto parts stores. Use a new battery. Old batteries can harm the circuit boards and are no longer useful.

You'll want to start by opening the fob. It might be a bit tight but with the help of a flat screwdriver you will be able split the halves. Then, you can insert the screwdriver into the edges of the fob, and then lift the clips holding it in place. They are easily broken so be cautious and work slowly.

After replacing the battery replace the fob, then check to see if everything is functioning just as it should. If it isn't working after pressing the button several times, make sure that the contacts are clean. It is also possible to test it with another key fob to determine whether the issue is limited to the specific key. If it isn't the case, there could be another reason that the key fob isn't functioning. For instance, it could be that the button is worn out. This would only make the button work infrequently but not continuously.

Interference

The key fob has tiny transmitters to transmit a short-range radio signal to a device in your vehicle. Its function is to allow your vehicle to recognize the key fob and open its doors as you approach it and start when you press the ignition button.

The problem is, interference can sometimes interfere with this communication. If you charge your second-generation Apple Pencil while holding the fob (via iGeneration) it could stop you from unlocking the vehicle.

Other electronic devices that operate on the same frequency can also interfere with the fob's signal. Garage door openers, or tire pressure monitoring devices can be affected. A transmitter in your home could be interfering however it would be difficult for an expert to test.

Your key fob might require reprogramming. This procedure requires the transmitter inside your fob to be recognized by the receiver inside your mini cooper S key and a distinct code is assigned to each pairing. Fobs usually need to be changed when they're removed or replaced, if you purchase a new one and, in some instances it's when a battery has been changed. To reprogram a fob follow the steps in the owner's guideline or ask a dealer for assistance.

Faulty chip

Modern electronic key fobs offer convenience and function over traditional manual keys, but they can also be more susceptible to damage. A damaged chip is among the most frequent problems that could stop your key fob from functioning correctly. This is usually a simple fix.

If your fob keeps not turning on your car, this is a sign that the chip has become malfunctioning. The problem can usually be resolved by replacing the battery which is cheap and easy to locate at the hardware store or a big-box retailer. Make sure you purchase a replacement mini key battery that is compatible with your model of vehicle to avoid any further issues.

The fob should not be exposed to water, or soapy residue. Water can cause corrosion and disrupt the circuitry. If this is the case, you will have to wash it using isopropyl alcohol, or an electronic cleaner prior to installing the new mini key battery.

It is a good idea to test the operation of the fob before driving the vehicle. With a voltmeter, test the voltage of the new battery to see whether it's at an acceptable level. If not, you could have to replace the entire remote chip. A certified technician from a dealer can assist in determining the best solution for you vehicle.

Reprogramming

We provide a slim replacement key fob to replace mini key the old key fob. It works the same as the original, and the full fitting instructions are included with every purchase. We also provide the customer with a support line.

Often, your mini key fob will begin to malfunction or stop working completely. This can be due to various reasons and it can be very frustrating as the car will not start, and you'll have to wait for a while to be able to drive again. However, reprogramming your key fob may be the solution and it is easy to do.

First, check that the battery inside your key fob is in good condition and hasn't been replaced. Once a new battery is installed, it is not able to be reprogrammed and it would need to be replaced again.

Once the key fob has been programmed, it will be capable of communicating with the car and control all its functions like the radio, air conditioning and even the sunroof and windows. It can also activate comfort access, which implies that the doors of the driver's compartment will automatically open and close as you enter the car or that the seats will be able to move to help you get in and out. The key fob is able to adjust the mirrors, the radio, and the temperature control settings according to your preference.