Key Fob Battery 2021 Mazda CX5: Troubleshooting and Replacement

Is your 2021 Mazda CX5 key fob acting up? A dead or weak battery might be the culprit. This comprehensive guide will walk you through identifying key fob battery issues, replacing the battery, and even programming a new key fob yourself. Let’s get your Mazda CX5 key fob back in tip-top shape!

Common Signs of a Dying Key Fob Battery

Before you start digging around for a new battery, it’s good to confirm that the key fob is indeed the issue. Here are some telltale signs that your 2021 Mazda CX5 key fob battery might be on its last legs:

• Decreased Range: You find yourself having to stand closer to your car for the key fob to lock, unlock, or start the engine.
• Intermittent Functioning: The key fob works sometimes, but not others, or requires multiple button presses.
• Warning Lights or Messages: Your Mazda CX5’s dashboard may display warnings about a weak key fob battery.
• No Response: The key fob doesn’t respond at all when you press any buttons.

What Battery Does a 2021 Mazda CX5 Key Fob Use?

The 2021 Mazda CX5 key fob uses a CR2032 battery, a common type of lithium coin battery available at most electronic stores, auto parts stores, and online retailers.

2021 Mazda CX5 Key Fob Battery Replacement

How to Replace Your 2021 Mazda CX5 Key Fob Battery: A Step-by-Step Guide

Replacing the battery in your Mazda CX5 key fob is a relatively simple process that you can do at home with a few basic tools. Here’s how:

1. Locate the Key Fob’s Emergency Key Slot: On the back of your key fob, you’ll find a small slot.
2. Release the Emergency Key: Insert the tip of your fingernail or a small flathead screwdriver into the slot and gently pry open the key fob’s casing.
3. Separate the Key Fob Halves: Carefully separate the two halves of the key fob to reveal the battery compartment.
4. Remove the Old Battery: Gently pry out the old CR2032 battery. Be careful not to damage the battery contacts.
5. Install the New Battery: Insert the new CR2032 battery, making sure the positive (+) side is facing up.
6. Reassemble the Key Fob: Align the two halves of the key fob and press them together until they snap securely back into place.
7. Test the Key Fob: Try locking and unlocking your car, as well as starting the engine, to ensure the new battery is working correctly.

Programming a New Mazda CX5 Key Fob

In some cases, like if you’ve purchased a new key fob, you might need to program it to your Mazda CX5. While the exact procedure can vary slightly depending on the model year and trim level, here’s a general outline:

1. Get in the Driver’s Seat: Close all doors and have all your keys (including the new one) handy.
2. Insert and Remove Key: Insert the working key into the ignition and remove it. Repeat this process six times within ten seconds.
3. Open and Close Driver’s Door: Open and close the driver’s side door six times.
4. Insert Key and Turn to ‘ON’: Insert the working key into the ignition and turn it to the ‘ON’ position (without starting the engine). Leave it in this position for at least 60 seconds.
5. Remove and Reinsert Key: Remove the key and then reinsert it without turning the ignition.
6. Programming Mode: If you’ve followed the steps correctly, the doors should lock and unlock automatically, indicating that you’ve entered programming mode.
7. Program New Key: Press and hold the lock button on the new key fob for two seconds, then release. The doors should lock and unlock again to confirm successful programming.
8. Repeat for Additional Keys: Repeat step 7 for any other new keys you need to program.
9. Exit Programming Mode: Turn the ignition to the ‘OFF’ position. The doors should lock and unlock one last time to signal that programming is complete.

Important Note: If you are encountering difficulties programming your Mazda CX5 key fob, it is always best to consult your owner’s manual or contact a qualified Mazda dealership or automotive locksmith for assistance.

Frequently Asked Questions about Mazda CX5 Key Fobs

Q: Can I drive my Mazda CX5 with a low key fob battery?

A: While you might be able to unlock your doors and start your Mazda CX5 a few times with a low key fob battery, it’s not recommended. The key fob’s range and functionality will continue to deteriorate, potentially leaving you stranded.

Q: How long do Mazda CX5 key fob batteries last?

A: The lifespan of a Mazda CX5 key fob battery can vary depending on usage, but they typically last between 3 to 5 years.

Q: Can I replace my Mazda CX5 key fob battery myself?

A: Yes, replacing the key fob battery is a quick and easy DIY task that most people can do at home with minimal tools.

Q: What if I replace the battery and my key fob still doesn’t work?

A: If your Mazda CX5 key fob isn’t responding after a battery replacement, there could be other issues, such as a faulty key fob or a problem with your car’s receiver. In these cases, it’s best to consult with a qualified professional.

Need More Help with Your Mazda CX5 Key Fob?

We hope this guide has helped you get your 2021 Mazda CX5 key fob back in working order! But if you’re still having trouble or need expert assistance, KEYFOBPROG is here for you. Contact us via Whatsapp at +1 (641) 206-8880 or visit us at 1326 N Houston St, Amarillo, TX 79107, USA. Our team of automotive locksmith and Key Fob Programming specialists is available 24/7 to answer your questions and provide the support you need.

Explore More:

• Having trouble with your Mazda CX5’s keyless entry system? Check out our in-depth article on common keyless entry problems and solutions.
• Did you know we offer a wide range of car key programming and replacement services? Learn more about our services and find the right solution for your vehicle.