The Ugly Real Truth Of Mazda 6 Key Fob Changing the Battery in Your Mazda 3 Key Fob

It's a pain to drive off at the end of a long day and find that the key fob is dead. Luckily, this is an easy fix with an easy battery replacement at an hardware store or a big box retailer.

Incorporating a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from having to be transported to a dealership and having them re-program your keys.

Battery Replacement

You can replace the battery on your Mazda 3 keyfob at home. You should only replace it if the battery dies or if you get a message that reads "Low keyfob battery" on the multi-information display. Replace battery."

You'll need a flathead screwdriver and tape and patience to open the case. Locate a notch or gap in the bottom metal part of the Mazda 3's key fob and then insert the tip of the screwdriver in it to cut off the lower part. Repeat this process for the top metal part Be careful not to scratch the rubber ring at bottom of the key fob's case.

Once the fob case has been open, you'll see the slots on either side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently open the case, starting on one side and then moving to the other. Remove the battery that was used and place in a new CR2025 and make sure it's face-up for proper polarity. Finally, put the cap back on and reattach both sides of the key fob case, pressing until you hear them click.

After replacing the battery After replacing the battery, lock and unlock your doors to verify that the fob works. If everything appears to be working then you can begin using the Mazda 3's remote features in the road!

Pairing Issues

If your key fob stops suddenly it could be because the transmitter in the car has been damaged. It's usually a job for a professional, and you will require a brand new key fob.

If you've tried to replace the battery and reprogram the key fob, but it's not working, the chip inside the key fob might be defective. This can happen if the key fob was dropped on hard surfaces, exposed to salt water or even touched by dirty hands.

You'll need the small "key", which is inserted into the seam, to remove the circuit board and diagnose the problem. You can then check the electronic chip for damage or corrosion. To prevent damaging the chip, it is best to use a fresh paper towel.

It is also possible to take a close look at the battery connector's terminals and examine if they're damaged or cracked. If this is the case, carefully soldering them back in place will usually restore the function of the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can easily be soldered back into place and also if the button is physically snapped off.

Interference Signals

There is nothing more frustrating than glancing at a "No Fob Detected" message when trying to start your car. It usually happens at the most unpopular time, such as when you're running late for work or when you are picking up your children from daycare or school. The good news 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 signal from the vehicle making it unable to work correctly. This can be caused by objects such as weather conditions, buildings as well as transmitters operating on the same frequency. Interference could occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.

The key fob can also be damaged if exposed to water or salty water. The water can penetrate the rubber seals of the electronic chip, particularly when the key fob has been submerged in water for a long duration. This can cause the chip to stop working and may require replacement of the key fob. If you own a programmable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does not work, the chip is likely to be damaged and needs to be replaced.

Locking/Unlocking the Doors

The buttons on the key fob transmit electronic signals to a solenoid inside the car, which transforms the signal into a mechanical action that locks and unlocks the doors. If the door lock isn't functioning, the issue could be a solenoid issue that requires analysis with the help of an expert auto repair shop.

A dead 12 volt battery could also hinder the fob from working effectively. This happens when the battery is unable to charge or if the contactors become corroded, and stop transferring electricity. This issue can be solved in minutes with a new battery.

If the key fob won't work after you replace the battery or program it again the issue could be in the receiver module. This device interprets radio frequency signals sent by the key fob to control the vehicle. If it malfunctions, it can be expensive to fix.

To check if this is the case, begin by putting your spare key into the key slot and turning the ignition to ON. Press mazda replacement key www.g28carkeys.co.uk in a period of 10 seconds, without taking it out. The Mazda 3 system synchronizes the key to the vehicle, and you can use it as your primary remote for driving. This lets you program up to three keys.