Hey everyone, let's talk about something that can be a real pain in the you-know-what: a dead key fob battery! Specifically, we're focusing on the 2020 Mazda CX-5. If you're here, chances are your key fob is acting up, maybe not unlocking your doors reliably, or perhaps it's just plain dead. Don't worry, it's a super common issue, and the good news is, replacing the battery in your 2020 Mazda CX-5 key fob is something you can totally do yourself. No need to run to the dealership and pay a hefty fee for something so simple! This guide will walk you through, step by step, so you can get back to unlocking your car with ease.

So, why does your key fob battery die in the first place? Well, it's a little circuit that's constantly working. It’s transmitting signals to your car, and over time, that battery power depletes. The lifespan of a key fob battery can vary, usually lasting anywhere from a year to a few years, depending on usage. If you are a heavy user of your key fob, the battery may die sooner. Also, the ambient temperature can affect it as well.

Before we dive into the nitty-gritty, it's important to have the right tools and parts. You will need a new CR2025 battery, which is the most common battery type for this model. You can grab one at most drugstores, supermarkets, auto parts stores, or even online. Then, you'll need a small flathead screwdriver or a pry tool. That's pretty much it! Are you ready? Let's get started!

Symptoms of a Dying Mazda CX-5 Key Fob Battery

Before you start swapping batteries, how do you know if your key fob is actually the problem? Here are some telltale signs that your 2020 Mazda CX-5 key fob battery needs a change:

• Reduced Range: Your key fob might only work when it's very close to your car. If you have to practically touch your car to unlock it, the battery is likely on its last legs. This is usually the first symptom. The key fob transmits a signal to your car's receiver. Over time, that signal gets weaker as the battery runs down. So, if you notice your key fob only works at a shorter distance than it used to, that's a good indication. Do you find yourself having to stand right next to the car to get it to unlock? Yeah, it's time for a change!
• Intermittent Functionality: Sometimes it works, sometimes it doesn't. This can be super frustrating. You press the button, and nothing happens. Then, you try again, and it works. This inconsistency is another sign of a weak battery. If your key fob is acting up sporadically, the battery is probably struggling to provide consistent power.
• Warning Lights: Some Mazda CX-5 models have a low battery indicator on the dashboard. This is usually a key fob symbol with a battery icon next to it. If you see this, you know exactly what the problem is. The car's computer can detect a weak key fob battery and will alert you. Consider yourself lucky that you have it, as the issue is confirmed and you can take action.
• Failure to Start the Car: In some cases, a very weak battery can prevent your car from starting. If your car won't start when you press the start button, and you suspect the key fob, try holding the key fob close to the start button while you press it. If the car starts, it's almost certainly the battery in your key fob. This happens because the key fob needs to transmit a signal to the car to enable the ignition. If the battery is too weak, it can’t do this.
• Unlocking Issues: The most common sign is that your key fob can't unlock the doors, or the range is diminished. This is usually the first sign people experience. If your remote unlock button fails on the first try, or you have to press it multiple times to unlock your car doors, it's time to change the battery.

If you're experiencing any of these issues, it's time to replace your 2020 Mazda CX-5 key fob battery. It's a quick and easy fix that will save you time and money.

Tools and Materials Needed for the Key Fob Battery Replacement

Okay, before you start, let's make sure you have everything you need. You don't want to get halfway through the process and realize you're missing something. Here's what you'll need:

• New CR2025 Battery: This is the most crucial part. The CR2025 battery is a small, coin-shaped battery that's readily available. Make sure you get the right size; it's the most common type for the Mazda CX-5 key fob. You can find them at most stores. Just look for the CR2025 marking on the battery, this is what you need! It's super important.
• Small Flathead Screwdriver or Pry Tool: You'll need this to open the key fob. A small flathead screwdriver will do the trick, or a plastic pry tool will help prevent any scratches on the key fob. Some people use a small knife, but be extremely careful if you choose to do so. The goal is to gently pry the key fob open without damaging it. You just need something small and thin enough to fit into the seam of the key fob and allow you to pry it open. Be careful not to use too much force!
• Optional: Microfiber Cloth: To clean up any fingerprints or smudges on your key fob after you're done. This is not essential, but it will keep your key fob looking nice and tidy.

That’s it! With these simple items, you'll be well on your way to a successful battery replacement. Preparing these items beforehand will save you time and effort and makes the whole process smoother.

Step-by-Step Guide: Replacing the Battery in Your 2020 Mazda CX-5 Key Fob

Alright, let’s get down to business. Here's a step-by-step guide on how to replace the battery in your 2020 Mazda CX-5 key fob. I'll make it as simple as possible.

1. Prepare the Key Fob: First, locate the small release button or switch on the side or back of your key fob. This is usually a small button you can press. Press this button to release the metal key that is inside the key fob. Set the metal key aside, you won't need it. But just in case you need it, make sure you put it in a safe place.
2. Open the Key Fob: Look for a seam around the edge of the key fob. This is where you'll insert your flathead screwdriver or pry tool. Gently insert the screwdriver or tool into the seam and twist it to start separating the two halves of the key fob. Be careful not to scratch the plastic. Work your way around the edges, carefully prying the key fob open. It may take a little bit of effort, but don't force it. Take your time to avoid causing damage.
3. Remove the Old Battery: Once the key fob is open, you'll see the battery inside. Note how the old battery is positioned (which side is up). Use your screwdriver or pry tool to gently pry the old battery out of its holder. Be careful not to damage the circuit board. Most key fobs have a small clip or holder that secures the battery in place. Carefully pry it out from under the clip. It should pop right out.
4. Insert the New Battery: Take your new CR2025 battery. Make sure it's the same type as the old one (CR2025). Insert the new battery into the key fob, making sure the positive (+) side is facing the correct way (check the markings on the key fob to ensure the correct orientation). The positive side is usually marked on the battery itself.
5. Close the Key Fob: Once the new battery is in place, carefully align the two halves of the key fob and press them together until they snap shut. Ensure it is closed tightly and there are no gaps. You should hear a clicking sound as the key fob snaps back together. Make sure the halves are properly aligned to prevent any damage.
6. Test the Key Fob: Now, test your key fob to make sure it's working. Try locking and unlocking your car doors to confirm the battery replacement was successful. If it works, you're good to go! If not, double-check that the battery is inserted correctly and that the key fob is properly closed. If it still doesn’t work, you might need to troubleshoot further. Sometimes, you may need to re-sync the key fob with the car. This is rarely the case, but it's worth knowing.

Troubleshooting Common Issues

Even with the best instructions, sometimes things don't go as planned. Here are a few troubleshooting tips for common issues you might encounter when replacing your 2020 Mazda CX-5 key fob battery:

• Key Fob Still Doesn't Work: Double-check that you inserted the battery correctly, with the positive (+) side facing the right direction. Also, make sure the battery is a CR2025. Try another new battery, as sometimes batteries can be faulty. Ensure that the key fob is properly closed; sometimes, a loose fit can cause problems. Also, check that the battery is properly seated in the holder.
• Key Fob Buttons Don't Respond: Sometimes, the buttons on the key fob can get stuck or damaged. Check for any debris or obstructions under the buttons. You can also try cleaning the buttons with a cotton swab dipped in rubbing alcohol. If the buttons are physically damaged, you may need a new key fob. There are also videos online if you have the same issues.
• Car Won't Start: If your car won't start after replacing the battery, and you suspect the key fob, try holding the key fob close to the start button while pressing it. This allows the car to recognize the key fob and start the engine. This is a failsafe. If it starts, it's definitely the key fob battery.
• Key Fob is Damaged: If you accidentally damage your key fob during the battery replacement process, you may need a replacement. Contact your local Mazda dealer for a new key fob. Keep in mind that replacing the entire key fob can be expensive.

If you're still having trouble, consider consulting a professional.

Final Thoughts

Replacing the battery in your 2020 Mazda CX-5 key fob is a simple process that can save you time and money. By following these steps, you can easily get your key fob working again and avoid the hassle of dealing with a dead battery. Remember to always use the correct battery type (CR2025), and take your time to avoid damaging your key fob. Now you know how to replace a 2020 Mazda CX-5 key fob battery. And there you have it!

If you found this guide helpful, please share it with your friends and family. Safe travels!