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Changing the Battery in Your Mazda 3 Key FobThere is nothing more frustrating than getting to your car after a long day, and discovering that your key fob battery is dead. Fortunately, it is an easy fix with an easy battery replacement at a hardware store or big box retailer.A spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be towed to the dealership and having them re-program your keys.Battery ReplacementYou can change the battery on your Mazda 3 keyfob at home. But, you should only replace the battery if it goes out of service, or if the key fob displays a message on the multi-information display, "Low key fob battery. Replace battery."To open the key fob case you'll need a tape-wrapped flathead screwdriver, along with some patience. Locate a notch or gap in the bottom portion of the metal of your Mazda 3's key fob, and then insert the head of the screwdriver into it to break off the lower part. Repeat the process for the top piece of metal however, be careful not to scratch the rubber ring at the bottom of the case.There's a slot on both sides of the fob case, which houses the battery. Start on the other side of the case and then gently lift it up. Remove the battery that was used and place in a new CR2025 to ensure that it's face-up for proper orientation. Attach the cap to the battery the other side and attach both sides of your key fob case by pressing until they click.After replacing the battery, lock and unlock your doors to confirm whether the fob is working. If new mazda key G28 looks good the Mazda 3 remote features can be used again.Pairing IssuesThis could mean that the transmitter in your car is damaged. This is usually a matter of an expert repair and will likely require a new replacement key fob.If you have tried replacing the battery and programming the key fob, but this does not solve the issue it is possible that the chip inside the key fob may be damaged. This could happen if the keyfob was dropped or exposed to saltwater or touched by dirty fingers.You will need to locate an extremely small "key" that is inserted into the seam, to take off the circuit board and identify the issue. You can then examine the electronic chip for damage or corrosion. To prevent damaging the microchip, it is best to use a fresh paper towel.If you're unsure then you should also examine the battery connector terminals for cracks or breakage. If this is the situation it is possible to solder the terminals back into place will typically bring back functionality to the key fob. You can also inspect the buttons for damage or wear. If the buttons are loose, they can easily be re-soldered in the event that the button is physically snapped off.Interference SignalsThere are few things more frustrating than trying to start your car only to see the message "No Fob Detected". This usually occurs at the most unpopular moments, such as when you're running late for work or picking up children from daycare/school. The good thing is that there are steps you can take to pinpoint the issue and figure out the cause.Interference signals can interfere with the remote key fob's signal to the vehicle, causing it to not function properly. This could be caused by objects like weather conditions, buildings, and transmitters that use the same frequency. Interference could also occur if you install aftermarket equipment in your vehicle that transmits at the same frequency as the key fob.The key fob can also be damaged if it is exposed to salt water or water. The water can penetrate the rubber seals of the electronic chip particularly when the key fob is submerged in water for an extended duration. This can cause the chip to stop working and will require replacement of the key fob. If you have a programable key it is possible to clean the chip using isopropyl alcohol or an electronic cleaner to aid in its return to working. If this doesn't help you can be sure that the chip has been damaged and needs to be replaced.Locking/unlocking the DoorsThe key fob's buttons send electronic signals to a solenoid in the car. It then transforms the signal into a mechanical action that locks and unlocks doors. If your door lock doesn't work it could be due to an issue with the solenoid. This requires professionals from auto repair shops to examine.A dead 12 volt battery could also stop the fob from functioning properly. This could happen if the battery loses charge or if the contacts get corroded and stop transferring electricity. The good news is that a new battery is able to fix this issue in just minutes.If the key fob doesn't work after changing the battery or re-program it then the problem may be in the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. If it malfunctions it could cost a lot to fix.To check whether this is the case, start by inserting the spare key into the key slot and setting the ignition to ON. Press the key fob two times in a period of 10 seconds, without removing it. The Mazda 3 system synchronizes the key to the vehicle and you can now use it as your primary remote for driving. You can program up to three keys in this manner.