How to change a mazda key fob battery

How to change a mazda key fob battery

Having your Mazda key battery replaced by a qualified service technician is best to avoid damaging your key.

Like any battery, the battery in your Mazda’s key fob could go dead, requiring a replacement. But how do you open up the Mazda key fob? Although it is recommended you work with certified technicians at an authorized Mazda dealer to avoid damaging your key fob, it is your car after all, and sometimes you’ll want to handle your own maintenance. That’s why we’re here to show you how to replace the Mazda key fob battery (current for the 2016 model year).

What You Will Need:

  1. Your key fob.
  2. A tape-wrapped flathead screwdriver.
  3. A replacement battery.

If you’re unsure if your battery is really dead or at low power, there are a few ways to tell. If the KEY dashboard warning light illuminates in the instrument cluster after the engine is off, if the key fob or its operation indicator light do not work or if the key fob’s operational distance is less than normal, your key’s battery is likely headed the other way. Now, if you have all the needed materials, let’s get started.

Changing Mazda Key Battery

How to change a mazda key fob battery
Be sure to use your owner’s manual as the best reference and for the most up-to-date procedures for replacing the key battery. These steps are updated for the 2016 model year. Keep in mind that other model years may differ.

  1. Remove the auxiliary key by pressing the knob on the back of the key fob. [What is the auxiliary key?]
  2. Take your tape-wrapped flathead screwdriver and insert it into the opening. Twist it toward the end opposite of the opening to loosen the key fob cover slightly. Once the cover is loosened, insert the screwdriver into the gap you’ve created on the outside of the key fob and slide it down to the other end of the key fob to further loosen the cover until you can remove it.
  3. Once the cover is removed, you can remove the round battery cap. Then, remove the battery. If the rubber ring detaches during this step, be sure it does not get scratched or damaged.
  4. If necessary, reattach the rubber ring before inserting a new battery.
  5. Then, take your new battery, with the positive side facing the top of the key fob, and insert it into the key.
  6. Replace the battery cap.
  7. Replace the key fob cover, which should snap into place.
  8. Lastly, reinsert the auxiliary key.

[Read more: What to do if you lose your car keys]

Again, though you can try figuring out how to replace the Mazda key fob battery yourself, we always recommend working with a qualified Mazda technician to avoid damaging the key. Either way, be sure to consult your owner’s manual before attempting to disassemble the key fob in anyway, or schedule an appointment with our service team online.

How to change a mazda key fob battery

A Step-By-Step Guide on how to Replace Your Key Fob Battery in a 2020 Mazda CX-5

As a company that prides itself on its next-generation designs and technology, the Advanced Keyless Entry system is a staple among current Mazda vehicles. With it, you can do many things with just the single press of a button. But what happens when the battery runs out? Check out a step-by-step guide on how to replace the battery in a 2020 Mazda CX-5, courtesy of Bob Baker Mazda.

What You Need

When replacing the Mazda CX-5 key battery, you will need a few items. This includes a CR2025 battery or equivalent to place into the key fob, a tape-wrapped flathead screwdriver or equivalent tool with a softer tip, and a clean space to place your key fob parts to ensure they don’t go missing during the process.

Step-By-Step Process

  1. Press the small knob and pull out the auxiliary key.
  2. Twist a tape-wrapped flathead screwdriver (or flat, soft-tipped item) into the small side space to gently pry open.
  3. Insert your tool into the outer gap and slide it along the opening. Twist to remove the cover.
  4. Remove the battery cap and battery. Make sure the rubber ring is not damaged or detached. If it detaches, reattach it before placing in a new battery.
  5. Insert a new battery with the positive pole facing up. Cover the battery with the battery cap.
  6. Close the cover. Re-insert the auxiliary key.

Find Help for Mazda CX-5 Maintenance at Bob Baker Mazda

If you don’t feel comfortable replacing the battery on your own, the process can be done right here at our location in the Carlsbad and San Diego area. Stop in, give us a call, or schedule any other maintenance tasks with us today and let us help you out!


Check Out: How to Jump Start Your Mazda


What kind of battery does a Mazda key fob take?

A replacement battery on hand (CR2025 battery) Your Mazda key fob. A small flat head screwdriver with the head wrapped in tape to prevent scratches.

Can I replace a car key fob battery myself?

Yes, you can. DIY is quick, simple, and cheap. To do this, pry apart the key fob and replace the coin battery inside with a new one.