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Changing the Battery in Your Mazda 3 Key FobThere's nothing more annoying than stepping into your vehicle after a long and tiring day and finding that the key fob battery is dead. Luckily, this is an easy fix using a simple battery replacement from an electronics store or big box retailer.A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take your vehicle to a dealer to have them reprogram the keys.Battery ReplacementYou can change the battery on your Mazda 3 keyfob at home. It is recommended to replace it if the battery is dead or you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."You'll need to use a flathead screwdriver and tape and patience to open the case. Find a gap or notch in the bottom metal part of your Mazda 3's key fob, and insert the head of the screwdriver in it to cut off the lower part. Repeat the process for the top piece of metal, but be sure not to scratch the rubber ring that is on the bottom of the case.Once the fob case has been open, you'll see an opening on either side of the case, which houses the battery. Make use of the tape-wrapped flathead screwdriver to gently the case open, beginning with one side and moving to the next. Remove the old battery and put in a new CR2025, making sure that it's face-up for the correct orientation. Finally, put the cap of the battery back on and reattach both sides to the key fob's case, pressing until you hear them click.After replacing the battery, lock and unlock your doors to ensure that the fob is working. If everything is in order the Mazda 3 remote features can be used again.Pairing IssuesThis could indicate that the transmitter in your car has been damaged. It's usually a task to a professional and you require a new key fob.If you've attempted to replace the battery and reprogram the key fob but it's not working the chip inside the key fob might be faulty. This could happen if the key fob has been dropped on hard surfaces, exposed to salt water or even brushed by dirty hands.To determine the cause it is necessary to locate a small "key" located in the fob's seam which allows you to take it apart and remove the circuit board. You can then check the chip for corrosion or damage. It is recommended to clean the paper towel to prevent damaging the microchip.It is also possible to examine the battery connector terminals to check if they're damaged or cracked. If this is the case you can solder the terminals back into place will typically restore the functionality of the key fob. You can also check the buttons for wear or damage. If they are loose, they can be soldered back into place, unless one has physically snapped.mazda 3 spare key G28CarKeysThere are few things more frustrating than trying to get the engine started in your vehicle and getting the message "No Fob Detected". It happens at the worst occasions, such as when you're running late to work or you're trying to collect your children from daycare/school. There are several things you can do to find out what's the cause.Interference signals can cause the remote key fob to stop functioning properly. This can be caused by objects such as buildings, weather conditions, and transmitters that use the same frequency. Interference could also occur if you have an aftermarket device installed in your vehicle that transmits at the same frequency as the key fob.The key fob may also be damaged if it is exposed to salt water or water. Water can penetrate the rubber seals of the electronic chip especially when the key fob is submerged in water for a lengthy duration. The chip may cease to function and require replacement of the keyfob. If you have a key which can be programmed to work, you can clean it with isopropyl or electronic cleaners to bring it back to its original function. If this doesn't help then it's likely that the chip is fried and must be replaced.Locking/Unlocking the DoorsThe buttons on the key fob transmit electronic signals to the solenoid of the car, which transforms this signal into a mechanical action. This locks and unlocks doors. If the door lock is not working, the problem could be a solenoid malfunction that requires some investigation with the help of a professional auto repair shop.A low-voltage battery can hinder the fob from functioning properly. This happens when the battery loses charge or the contacts become corroded, and stop transferring electricity. This issue can be solved in a matter of minutes by replacing the battery.The receiver module could be the problem if the key fob won't work after you replace the battery or reprogram the device. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It could be a costly repair if it becomes faulty.To check 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 will now sync the key to the car and you can use it as your primary remote for driving. This allows you to program up to three keys.