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Changing the Battery in Your Mazda 3 Key FobIt can be a bit frustrating to get into your car at the end of a long workday and find that the key fob is dead. This is a simple solution that can be accomplished at a major box retailer or hardware store.The addition of a spare key fob to your Mazda 3 can be an affordable solution to free yourself from the hassle of being taken to the dealer and having them re-program your keys.Battery ReplacementChange the battery in the Mazda 3 key fob is an easy process that can perform at home. But, you should only replace the battery when it fails, or when the key fob displays a message in the multi-information display, “Low key fob battery. Replace battery.”To open the key fob’s casing it requires a tape-wrapped flathead screwdriver, along with some patience. Put the head of the flathead screwdriver in a notch, or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat this step for the top portion of the metal but be careful not to damage the rubber ring at bottom of the key fob’s case.You’ll find a slot on the opposite side of the case, which houses the battery. Start with one side of the case and gently open it. Take out the old CR2025 and replace it with a brand new one, making sure to put it on its face to ensure proper direction of polarity. Finally, place the cap back on and reattach both sides to the key fob case, pressing until you can hear them click.After you’ve replaced the battery Check the fob to verify that it works by locking and unlocking your doors. If everything is working you’re now able to use your Mazda 3’s remote features to drive again!Pairing IssuesThis could mean that the transmitter inside your car is damaged. This is usually a matter to a professional and you will need a new key fob.If you have tried replacing the battery and programming the key fob, but this isn’t solving the issue it is possible the chip in the key fob is defective. This could happen if the key fob was dropped on hard surfaces or exposed to salt water or even touched by dirty hands.To identify the issue it is necessary to locate a small “key” built into the edge of the fob which allows you to open it up and take out the circuit board. You can then examine the electronic chip for damage or corrosion. To prevent damaging the chip, it’s recommended to use a clean paper towel.If you’re unsure you are not sure, you can check the battery connector’s terminals for cracks or breaks. If this is the case, carefully connecting them back can generally restore the functionality of the key fob. Also, you can check the buttons to determine whether they are worn out or damaged. If the buttons are loose, they can be resoldered to their original position unless they have physically snapped.Interference SignalsFew things are more annoying than gazing at a “No Fob Detected” message when you attempt to start your car. It happens at the worst possible times, like when you’re late for work or pick up your children from school or daycare. The good thing is that there are a few steps you can take to pinpoint the issue and determine the cause.Interference signals can disrupt the remote key fob’s signal from the vehicle and cause it to not work correctly. This can be caused by things like weather conditions, buildings, and transmitters using the same frequency. Interference may also occur if you have an aftermarket device installed in your vehicle that transmits at the same frequency as the key fob.In addition, if your key fob is exposed to water or salt water it may be damaged. The rubber seals on the chip’s electronic components can be penetrated by water, particularly if it is submerged for an extended period of time like in the ocean or a pool at the beach. The chip can stop working and require replacement of the keyfob. If you have a key that can be programmed, you can clean it using electronic cleaners or isopropyl to bring it back to its original function. If mazda cx-5 replacement key uk doesn’t help, the chip is likely to be damaged and will need to be replaced.Locking/Unlocking of the DoorsThe buttons on the key fob send electronic signals to a solenoid in the car, which converts that signal into mechanical action that locks and unlocks doors. If your door lock fails to work it could be due to an issue with the solenoid. This requires expert auto repair shops to examine.A low-voltage battery can also stop the fob from functioning properly. This could happen if the battery loses its charge or if your contacts get corroded. The good news is that a new battery can resolve this issue in a matter of minutes.If the key fob doesn’t work after you change the battery or program it again then the problem may be related to the receiver module. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it malfunctions it could cost a lot to repair.To determine whether this is the case, start by putting your spare key into the key slot and turning the ignition to ON. Press the key fob button three times within 10 seconds without taking it. The Mazda 3 system synchronizes the key with the vehicle and you can use it as your primary driving remote. You can program up to three keys in this way.