How to Replace BMW Key Fob Battery: Complete Guide & Testing Steps

Ever found yourself locked out of your BMW because your key fob died at the worst possible moment? Frustrating, right? But don’t worry, we’ve got your back! In this article, we’ll show you the quick and easy steps to change the battery in your BMW key fob.

Imagine being able to effortlessly replace the battery in your key fob without any hassle. No more last-minute scrambles or unexpected lockouts. By the end of this read, you’ll be equipped with the knowledge to keep your BMW key fob powered up and ready to go whenever you need it.

Check Key Fob Model

When changing the battery in your BMW key fob, the first step is to identify the specific model you have. Different models may have varying battery types or placements, so it’s crucial to ensure you have the correct information before proceeding.

To check your key fob model:

  • Look for the model number on the back or inside the key fob.
  • Consult your BMW owner’s manual for guidance on identifying the key fob model.
  • Reach out to a BMW dealership for assistance if you’re unsure about the model.

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Knowing your key fob model upfront will save you time in getting the right battery and following the appropriate replacement steps.

Gather Necessary Tools

When it comes to changing the battery in your BMW key fob, having the right tools at hand is essential. Here’s what you’ll need:

  • Small Flathead Screwdriver: For opening the key fob case.
  • Replacement Battery: Make sure it matches the model specified in your owner’s manual.
  • Tweezers or Small Pliers: Helpful for handling the battery and placing it correctly.
  • Clean Cloth: Useful for wiping down the key fob and maintaining cleanliness during the process.

Remember to gather these tools before you begin the battery replacement to make the task smoother and more efficient.

Open Key Fob

When opening your BMW key fob, start by locating the seam along the perimeter.

Gently insert a small flathead screwdriver into the seam and twist to pop the cover open.

Take care not to apply too much pressure to avoid damaging the key fob casing.

Once the cover pops open, set it aside in a secure place to prevent losing it.

Replace the Battery

When it comes to changing the battery in your BMW key fob, it’s a straightforward process that you can easily do yourself. Here’s how to replace the battery:

  • Locate the battery compartment on your key fob. It’s typically found after removing the cover.
  • Carefully remove the old battery using tweezers or small pliers. Ensure you don’t damage the surrounding components.
  • Insert the new battery into the slot, making sure it’s placed in the correct orientation.
  • Close the battery compartment securely to prevent any damage or loss of the new battery.
  • Test the key fob to ensure the new battery is functioning correctly.

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Remember, having the right tools and a replacement battery matching the model in your owner’s manual is crucial for a successful battery replacement process. Take your time, follow these steps carefully, and you’ll have your BMW key fob working smoothly again in no time.

Test the Key Fob

To ensure your BMW key fob is functioning correctly after replacing the battery, follow these simple steps:

  • Press Buttons:

  • Try pressing the buttons on the key fob to check if they respond as expected.
  • Check LED Light:

  • Look for the LED light to illuminate when you press a button. This indicates that the key fob is sending a signal.
  • Test Keyless Entry:

  • Ensure that the keyless entry feature works by attempting to lock and unlock your BMW vehicle using the key fob.
  • Test the key fob’s range by trying to lock and unlock the car from various distances.

Remember, if the key fob doesn’t seem to be working correctly even after replacing the battery, you may need to consult a professional for further assistance.


You now have all the essential information to successfully change the battery in your BMW key fob. Remember to follow the guide carefully, ensuring you use the correct tools and battery type. After replacing the battery, test the key fob by checking button responsiveness, the LED light, keyless entry functionality, and the fob’s range. If you encounter any ongoing issues with your key fob, it’s best to seek professional assistance for further support. Enjoy the convenience of a fully functional key fob for your BMW!

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Frequently Asked Questions

1. What tools do I need to replace the battery in a BMW key fob?

You will need a flathead screwdriver and a replacement CR2032 battery for most BMW key fobs.

2. How do I test if the key fob is working after replacing the battery?

After replacing the battery, test the key fob by checking if the buttons respond, the LED light illuminates, keyless entry works, and the fob operates within the expected range.

3. What should I do if the key fob still doesn’t work after replacing the battery?

If the key fob continues to have issues after battery replacement, it is advisable to seek assistance from a professional to diagnose and fix the problem.

Battery industry professional with 5+ years of experience. Bachelor of Science in Electrical Engineering from Georgia Tech. Specializes in power systems and renewable energy.

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