How to Change Battery Key Fob BMW 328i

Replacing the battery in your BMW 328i key fob is a simple process that can save you time and money. A dying key fob battery can lead to frustrating situations like being locked out of your car, so knowing how to change it is essential. This guide provides a comprehensive walkthrough for changing your BMW 328i key fob battery, troubleshooting common issues, and answering frequently asked questions.

If your key fob is acting up, it’s likely time for a new battery. Learn how to easily change your BMW 328i key fob battery with this step-by-step guide. We’ll cover everything from finding the right battery to programming your key fob after the change. For more information on BMW key fobs, you can check out our guide on the 2007 BMW 328 key fob.

Identifying a Low Key Fob Battery

Several signs indicate a low key fob battery. These include decreased range, intermittent functionality (the car only unlocks sometimes), and the need to press the buttons repeatedly. Ignoring these signs can lead to being stranded, so it’s crucial to act promptly.

Signs of a dying key fob battery:

Reduced Range: You need to be much closer to the car for the key fob to work.
Intermittent Operation: The key fob works sometimes and doesn’t work other times.
Dim Indicator Light: The light on the key fob is weaker than usual or doesn’t illuminate at all.
Multiple Presses Required: You need to press the lock/unlock buttons multiple times to get a response.

BMW 328i key fob showing signs of a low battery

Gathering Your Supplies

Before you begin, gather the necessary tools. You’ll need a new CR2032 battery (easily found at most stores), a small flathead screwdriver or a key, and optionally, a small pick or pointed tool for leverage. Having everything ready will make the process smoother.

Step-by-Step Battery Replacement Guide

Locate the Release Button: On the side of your key fob, you’ll find a small release button. This button often has a key symbol next to it.
Insert the Flathead Screwdriver: Carefully insert the flathead screwdriver (or key) into the slot next to the release button and gently pry open the key fob casing. Be careful not to damage the plastic.
Separate the Key Fob Halves: Once the casing is slightly open, you can use your fingers or the pick to separate the two halves of the key fob.
Identify the Old Battery: Inside the key fob, you’ll see the CR2032 battery. Note its position and orientation.
Remove the Old Battery: Gently pry out the old battery using the flathead screwdriver or your pick. Avoid damaging the battery contacts.
Insert the New Battery: Insert the new CR2032 battery, making sure it’s positioned correctly, matching the orientation of the old battery.
Reassemble the Key Fob: Carefully snap the two halves of the key fob back together until you hear a click.
Test the Key Fob: Try locking and unlocking your car to ensure the new battery is working correctly.

You can find a helpful guide on how to change a battery in your BMW key fob for more detailed information and visuals.

Step-by-step guide to replacing the battery in a BMW 328i key fob

Troubleshooting

If your key fob still isn’t working after replacing the battery, you might need to re-synchronize it with your car. Consult your owner’s manual for specific instructions, as the process can vary depending on the model year. Sometimes, the issue might not be the battery but a faulty key fob socket. You can find information about key fob socket replacement for the BMW 328i 2007 on our website.

Conclusion

Changing the battery in your BMW 328i key fob is a quick and easy process that anyone can do. By following these steps, you can avoid the inconvenience and potential cost of a dead key fob battery. Regularly checking and replacing your key fob battery ensures smooth operation and keeps you from being locked out.

FAQs

What type of battery does a BMW 328i key fob use? A CR2032 battery.
How often should I change the key fob battery? Every 2-3 years, or when you notice signs of a low battery.
Do I need to program the key fob after changing the battery? Usually, no. However, consult your owner’s manual if the key fob doesn’t work after the battery change. You can find information on how to program a new BMW key fob on our website.
Where can I buy a replacement CR2032 battery? Most electronics stores, pharmacies, and supermarkets carry them.
What should I do if my key fob still doesn’t work after replacing the battery? Try re-synchronizing the key fob with your car. If that doesn’t work, consult a qualified automotive locksmith or BMW dealership.
Can I damage my key fob by changing the battery myself? It’s unlikely, but be careful when prying open the casing and handling the battery.
Is there a way to check the key fob battery level without opening it? Not directly, but observing the symptoms described above can indicate a low battery.

Common Scenarios

Key fob works intermittently: This often indicates a dying battery, but could also be a sign of a failing key fob.
Key fob completely stopped working: Try replacing the battery. If this doesn’t resolve the issue, the key fob may need to be replaced or reprogrammed.
Key fob range is significantly reduced: This is a classic sign of a low battery and usually resolves after replacing it.