How to Fix Common Mazda 3 Key Problems
The Mazda 3 is an elegant compact car with a premium interior and agile handling. It's also a great value compared to other compact cars available.
Lost keys can be a major troublesome. It can be costly to replace spare keys and also taking your vehicle to the dealer for reprogramming your key.
The key cannot lock or unlock the door

It's dangerous to lock the doors without locking them, especially when the vehicle is in motion. If the door is not locked when the vehicle is moving passengers could get out of the vehicle or suffer injuries. Keep keys out of reach of children to avoid this issue. Children may fi nd them interesting and play with them, which could cause the power windows or other controls to be activated and even make the vehicle move.
If you notice that your key fob isn't locking or unlocking doors, it probably means that the battery is dead. The button cell battery that is in the key fob is limited in its time of life, which is why it is vital to replace it regularly. A good battery will last between two and three years. When replacing the battery, it is important to select a battery that has the same size and voltage as the original one.
A key pairing issue may also be the cause of your key fob not working. It is possible that the key fob was not paired properly with the vehicle when it was first purchased. In this case, it will need to be reprogrammed by the dealership. Fortunately it is possible to do this in under a minute. The dealer can also reset the onboard computer to erase any remaining electricity. However, this won't make the key fob more able to lock or unlock doors.
Dead coin battery
If your key fob won't be turning on or unlocking your car, it may be due to the battery being dead. This is a common problem however, it is easily fixed. You can replace your battery at home and avoid a trip to a dealership. The procedure is simple and requires only a few simple tools.
Press the auxiliary key button on the back of the Mazda flip key. This will allow you to take off the auxiliary keys made of metal. There will be a slot on each side of the case once the auxiliary's metal is removed. Use a tape-wrapped flathead screwdriver break open the case starting with one side and then the opposite. Gently pull apart the two halves, then set them aside.
You can now change the battery on your key fob. You don't want to harm the rubber ring on which the battery is placed. After the battery has been replaced, you can reassemble the case and enjoy your new key fob!
You can find an alternative battery in most stores that sell batteries. Look for a CR2025 coin cell battery. These batteries are usually used in watches and calculators, but can also be found at auto parts stores and on the internet. Making the change to the battery in your Mazda 3 is easy and quick, and it will save you money when you travel to the dealer.
Key pairing issue
If you've been driving your Mazda 3 for a long time and suddenly it stopped working, there could be a problem with the remote keyless system receiver module. It is more likely to occur when the chip inside the key fob is damaged. This could be due to many causes, such as dropping the key or being exposed to water.
Fortunately, the key fob's electronic chips are protected by rubber seals, and should be fine even with the splash of water. Submerging the key fob into the ocean or pool water can pose a serious problem because the salty water is extremely conductive and may cause damage to electronic components.
If your key fob does not work, you may require a new battery. A quick search on the internet will show that there are many third-party replacement batteries. But, it's important to note that they might not work with your Mazda 3. It's a good idea purchase one from a dealership and ensure that it's sure to work with your vehicle.
After replacing the battery your key fob should be working again. If the remote doesn't respond when you press on the lock button, it is likely that the key has been stuck in power saving mode. Press the lock button five times, and hold it until the red light turns on.
Reprogramming mazda 3 key fob in a Mazda allows you to unlock and start the car without using the standard key. This is a great convenience, but the process of programming the remote or key may be difficult for some. This requires a machine which is only accessible to the auto locksmith or dealer. This machine is connected to the car's computer and initiates the process of programming for the new key or remote.
The first thing to do is have at minimum two keys that work for the Mazda. The next step is changing the program of a spare one. The functions of the new FOB will be temporarily turned off to protect the vehicle from theft. Once you've reprogrammed the new key, you can enable these functions again.
You can now make use of the new key for the ignition as well as to open the doors. It is recommended to test the new key first to make sure it works. Keep a spare set of keys if you're worried about losing your keys.
It's simple to add a spare Mazda key. You can save money by following these simple steps. This will save you money on a tow bill and an extra key.