How to Fix Common Mazda 3 Key Problems
The Mazda 3 is a stylish compact car that is agile in its handling and premium interiors. It's also a good deal cheaper than many other compacts on the market.
Lost keys can be a real problem. It's expensive to replace keys that are lost, and also driving your car to the dealer for reprogramming your key.
Keys not locking or unlocking doors
If doors are not locked, it can be very dangerous, particularly when the vehicle is moving. If the door is opened while the vehicle is moving, it can cause passengers to fall out or get injured. To avoid this issue, you should always keep the keys away from children. Children might find them interesting and play around with them. This could cause the power window or other controls to work and even move the vehicle.
If you notice that the key fob does not unlock or lock the doors, the battery might be dead. The button-cell battery in the keyfob has a limited life span, so you should replace it on a regular basis. A quality battery is expected to last between two and three years. When replacing the battery, it's important to choose a battery with the same voltage and size as the original one.
Another reason that the key fob may not be working is a key pairing issue. It could be that the key fob was not linked properly with the vehicle when it was first purchased. In this instance it must be reprogrammed by the dealership. Fortunately this can be accomplished in just a few minutes. The dealership can also reset the onboard computer to clear any residual electricity. This won't fix the issue with the problem with your key fob's ability to lock or unlock doors.
Dead coin battery
If your key fob is not working or unlocking your car, it could be because the battery is dead. This is a common problem however it can be easily fixed. You can replace the battery yourself, saving you going to the dealer. The procedure is simple and requires just a few simple tools.
Press the auxiliary key button located on the back of the Mazda flip key. This will open the metal auxiliary key and let you remove it. After the auxiliary key made of metal is removed, you'll notice an opening on either side of the fob case. Start with one side of the case and move around with a tape-wrapped screwdriver. Gently pull apart the two halves and put them aside.
You can now replace the battery of your key fob. Be careful not to damage the small rubber ring that the battery sits on. After the battery has been replaced, you can reassemble your case, and then enjoy the new key fob.

You can find replacement batteries at many stores that sell batteries. Look for a CR2025 battery. These batteries are typically used in watches and calculators and can be found at auto parts stores or online. Switching the battery in your Mazda 3 is easy and quick, and will save your money on a trip to the dealership.
Key Pairing Issue
If you've been driving your Mazda 3 for a long period of time and then it suddenly stopped working, there might be a problem with the remote keyless system receiver module. This is more likely to happen in the event that the internal chip on the key fob is damaged. This may be due to several reasons, like an accidental drop of the key or exposure to water.
Fortunately the key fob's digital chips are protected by rubber seals and should be fine with the splash of water. However, submerging it into the ocean or in pool water is an issue that is much more severe, as the highly conductive nature of salt can cause damage to the electronic components.
If your key fob does not function, you might need new batteries. A quick search on the internet will show that there are countless third-party replacement batteries. It's important to bear in mind that these batteries may not be compatible with your Mazda 3. It is best to purchase from the dealer to ensure that it's compatible with your Mazda 3.
After you've replaced your battery the key fob will be functioning again. If the remote does not respond when you press the lock button, it's likely that the key has been stuck in power saving mode. Press the lock button 5 times and hold it until the red light blinks.
Reprogramming the key
The keyless entry system of a Mazda allows you to open and start the car without using the traditional key. It's a great convenience but the process of programming the remote or the key can be confusing for a few people. This also requires a machine that is only available to the auto locksmith or dealer. The machine is connected to the car's computer and then begins the process of programming for a new key or remote.
The first step is to ensure that you have at least two working keys for the Mazda. Then, you can proceed with the reprogramming procedure of a spare key. Initially the functions of the new FOB are halted to protect the car from theft. After you've reprogrammed your new key, you can activate these functions in the future.
You can now utilize the new key to operate the ignition and to open the doors. You should first test it to ensure it works. If you're worried about losing your keys, it is a good idea to keep a spare key around.
It's simple to add an extra Mazda key. You can save money by following these simple steps. The Key Lab will save you money on towing costs and a spare key.