How to Fix Common Mazda 3 Key Problems

The Mazda 3 is a stylish compact car that is agile in its handling and a luxurious interior. It's also a great bargain compared to other compacts on the market.

Lost keys can cause a lot of troublesome. Not only does it mean you have to pay the dealer to tow your car and reprogram your key, but it can also cost money to replace spare keys.

Keys not locking or unlocking the doors

It's risky to lock the doors without locking them, especially when the vehicle is in motion. If the door is opened while the vehicle is moving it could cause passengers to fall out or suffer injuries. To avoid this issue it is recommended to keep your keys away from children. Children might find them interesting and play with them, which could cause the power windows or other controls to operate and even make the vehicle move.

If you notice the key fob doesn't unlock or lock the doors, the battery may be dead. The button-cell battery inside the key fob has a finite lifespan, which is why it's important to replace it regularly. A high-quality battery will last between two and four years. When replacing the battery, it is important to choose a replacement battery with the same size and voltage as the one that was originally.

Another reason why the key fob may not be working is a key pairing problem. It could be that the key fob was not connected properly with the car when it was first purchased. In this scenario, it will need to be reset by the dealer. This can be done in less than one minute. The dealer can also reset the on-board computer to remove any remaining electric current. However, this won't fix the key fob's ability to lock or unlock the doors.

Dead coin battery

It's possible that your battery is not functioning properly if your key fob isn't turning on or unlock your vehicle. It's a common issue, but one that is able to be repaired. You can replace the battery on your own, saving a trip to the dealership. The process is simple and requires just some tools.

Then, press the auxiliary key button on the back of your Mazda flip key. This will open the metal auxiliary key and let you take it off. There will be a slot on each side of the case after the auxiliary's metal is removed. Make use of a tape-wrapped flathead screwdriver open the case, beginning with one side and then the other. Gently pry apart the two halves, then set them aside.

Now you'll be able to see the inside of the key fob's battery, so you can replace it. You don't want to damage the rubber ring on which the battery is fixed. After the battery has been replaced, you can put it back into the case and enjoy your new key fob!

Most stores that sell batteries also carry a replacement battery. Find a CR2025 coin cell battery. These batteries are used primarily in watches and calculators, however, they can be bought at auto parts stores or on the internet. It's easy and quick to replace the battery in your Mazda 3. This will save you money by avoiding an appointment with a dealer.

Key Pairing Issue

If your Mazda 3 has been working for a while and then suddenly stops it could be due to the remote keyless receiver module. This is especially likely when the key fob's internal chip is damaged. This may be due to various reasons, including dropping the key or being exposed to water.

The key fob's electronics are protected by rubber seals, so a splash of rain shouldn't cause any damage. Submerging the key fob into the ocean or pool water can cause a significant issue due to the fact that salty water is highly conductive and can harm the electronic components.


If your key fob isn't working, it's likely that you're in need of an entirely new battery. A quick search on web will reveal that there are many third-party replacement batteries. It's important to keep in mind that these batteries may not be compatible for your Mazda 3. It's best to buy from a dealer to ensure that it is compatible with your Mazda 3.

After replacing the battery your key fob should be functioning again. However, if the remote isn't responding when press the lock button, the key is probably stuck in power-saving mode. Press the lock button five times and hold it until the red light appears.

Reprogramming an encryption key

The keyless entry system on the Mazda allows you to open and start the car without using the regular key. It's a great benefit, but the process of reprogramming the key or remote may seem complicated for some people. It also requires a special machine that only the dealer or an automotive locksmith can access. The machine is connected to the computer in the vehicle, and it begins the programming procedure for the new key or remote.

The first step is to ensure that you have at least two keys that work for the Mazda. You can then proceed with changing the programming of a spare key. Initially, the functions of the new FOB are turned off to safeguard the vehicle from theft. After you've reprogrammed the new key, these functions can be activated again.

Then, mazda 3 car key can use the new key to unlock the doors and start the engine. Check it out first to make sure it works. Keep a spare set of keys in case you are concerned about losing your keys.

It's simple to add an extra Mazda key. You can save money by following these simple steps. This can also save you from an expensive towing bill and will also save money on a new spare key.