Mazda 3 Key Fob Replacement

Mazda 3 owners may need to replace the battery in their keyfob in time. This is a simple task that you can complete yourself.

To change the battery, look for the small button on the back of the key fob. Press it, then take off the cover.

Lost Keys

Before the 1990s, losing your car keys was a minor inconvenience. You could replace keys at any hardware store, locksmith, or dealer, and it was fairly affordable to do this. Your car's top-of-the-line key fob can do much more than just secure the vehicle and open it. However, that added convenience comes with the cost of replacements.

The key fob features an embedded security chip in it that sends a unique code to the car's computer in order to let you unlock and start the engine. The key fob is also able to control other features such as the windows being rolled down in the hottest parking space and requesting the car to come to you so you can reverse in tight spaces (a feature that is available on certain Genesis GV60 sedans and Hyundai Sonata sedans).

Fortunately, Mazda's remote fobs aren't as expensive as those from other automakers. You can even replace the battery of your key fob yourself with a little bit of know-how. To do this, you'll need a small flathead screwdriver, an updated CR2025 battery, and your key fob. Use the red and directions buttons to lock or unlock your doors before changing the batteries.

If you want to save money on the cost of a Mazda 3 key fob replacement you can find one online that is OEM and does not require programming by a locksmith or dealer. You'll find many options on eBay but they might not have the exact colour or logo that your current key fob.

Lockouts

One of the most devastating things that can happen to a driver is becoming locked out of their car. Thankfully, there are a few tricks that drivers can use to get back in their vehicle. It is best to first call their local Mazda dealership or locksmith. This is a viable option because it's likely to be less expensive and more efficient than calling a tow truck. The locksmith or dealer will need to buy a key code from the database to create the new key fob which will usually cost about $100. It is important to secure this code.

Another thing that drivers can do if they are stuck outside their vehicle is to check the underneath of the key fob to locate an auxiliary button. There is usually an oblong, small button that can be press and held. This will open the doors of the vehicle and permit the owner to open them by hand.

Another way to enter an unlocked vehicle is using the emergency override feature. This allows you to use the key fob to override functions that have been suspended by the theft deterrent system. This will trigger the hazards lights and sound to prove that the doors, lids for the fuel filler or liftgate are shut.

Transponder Chips

You'll have to replace it if your key fob has a transponder that is built into the head of the L-shaped key. These chips come with an unique identification code that is used to start your car.

When you insert your key and turn it to ON the antenna ring sends out an impulsive radio frequency energy that reaches the transponder chip in the key's metal. The chip responds by sending an encrypted message to the antenna ring. This tells the car that the key is in good condition.

Most Mazdas come with a transponder chip with a rolling code that changes each time you turn it. This means that the key you're using won't work on your vehicle until you have a second copy that has the exact same code in the ignition cylinder.

Fortunately, it's not impossible to make your own replacement keys. If you're able to find an operational key, put it in your Mazda and turn the ignition to ON. If the key is able to start your vehicle, you'll be able to copy the information to the working key. You can also use the eraser method on your key fob in order to erase the current code, if needed. It is important to note that this method is not 100% guaranteed to work, since some transponder chips from recycled systems might not work correctly.

Programming

Losing your car keys can be costly and time-consuming. Mazda has made adding and programming an additional car key simple. It is possible to do this in only a few steps and you do not have to pay the dealer for the service. If you have a spare car key, this is the most efficient way to avoid having to pay for a tow and dealership costs.

The first step is to find a replacement battery to the fob. You can purchase one at an hardware store or a big box retailer for about $10. You'll also require an open-ended screwdriver that is flat to open the fob. The screwdriver's head must fit into a small space or space on the side of the fob. After removing the case replace the old battery.

Now is the time to program the new key fob into your vehicle. To do this, insert the first working key into the ignition, and turn it to ON. After about five seconds, and then switch off the ignition. Repeat the process with a second working key, and then your new (or spare) key. Once you've done this your newly programmed key should be in a position to start your Mazda. If not, it may be a problem with the key fob.