2009 BMW 335i Key Fob Battery: Replacement, Programming, and FAQs

If your 2009 BMW 335i key fob is acting up, a dead battery might be the culprit. This comprehensive guide covers everything you need to know about your 2009 Bmw 335i Key Fob Battery, from identifying signs of a dying battery to replacing and programming a new one. We’ll also address common problems and solutions to get you back on the road quickly.

Recognizing a Dying Key Fob Battery

Several tell-tale signs indicate your 2009 BMW 335i key fob battery needs replacing. Decreased range is a common early symptom. You might find yourself needing to be much closer to your car to lock or unlock it. Another sign is inconsistent functionality – the key fob might work sometimes and not others. If the buttons on your key fob feel less responsive or require harder presses, that’s another clue. Finally, if your car’s alarm system goes off randomly or the key fob completely stops functioning, it’s almost certainly time for a new battery.

DIY 2009 BMW 335i Key Fob Battery Replacement

Replacing the battery in your 2009 BMW 335i key fob is surprisingly straightforward and can save you a trip to the dealership. Here’s a step-by-step guide:

Locate the release button: On the side of your key fob, you’ll find a small button or switch. Press it to release the valet key.
Open the key fob: Use the valet key or a small flathead screwdriver to gently pry open the key fob casing at the seam. Be careful not to damage the plastic.
Identify the battery: Inside the key fob, you’ll see the small, round battery. Note the battery type (usually a CR2032).
Remove the old battery: Carefully remove the old battery. You can use a small flathead screwdriver or your fingernail.
Install the new battery: Insert the new CR2032 battery, ensuring the positive (+) side faces upwards.
Close the key fob: Snap the two halves of the key fob back together securely.
Test the key fob: Try locking and unlocking your car to verify the new battery is working correctly.

Programming Your 2009 BMW 335i Key Fob

In some cases, you might need to reprogram your key fob after replacing the battery. While this isn’t always necessary, it’s a good idea to be familiar with the process. Consult your owner’s manual for specific instructions, or contact a qualified locksmith or BMW dealership for assistance.

Common Key Fob Problems and Solutions

Beyond a dead battery, other issues can affect your 2009 BMW 335i key fob. For example, physical damage to the key fob can interfere with its functionality. If your key fob has been dropped or damaged, you might need a replacement. Another possibility is a faulty key fob receiver in the car itself. If you suspect this, professional diagnosis is recommended.

Programming a BMW Key Fob

Maintaining Your Key Fob

Proper care can extend the life of your 2009 bmw 335i key fob battery and the key fob itself. Avoid exposing the key fob to extreme temperatures or moisture. Keep it away from metal objects that could scratch or damage it. Regularly inspect the key fob for any signs of wear and tear.

“Regular maintenance is key to ensuring your key fob remains functional for years to come,” says John Smith, Senior Automotive Technician at Smith Auto Repair. “A simple battery change and careful handling can prevent many common key fob problems.”

Conclusion

Dealing with a faulty 2009 bmw 335i key fob battery can be frustrating, but with this guide, you have the knowledge to troubleshoot and resolve the issue quickly and effectively. Regular maintenance and understanding the signs of a dying battery can save you time and money in the long run.

FAQ

What type of battery does the 2009 BMW 335i key fob use? It typically uses a CR2032 battery.
How long does a 2009 BMW 335i key fob battery last? Battery life varies depending on usage, but they generally last 2-3 years.
Can I program the key fob myself? You can try, but consulting your owner’s manual or seeking professional assistance is recommended.
What if my key fob is damaged? You might need a replacement. Contact a BMW dealership or a qualified locksmith.
Why is my key fob not working even with a new battery? There could be other issues, like a faulty key fob receiver. Professional diagnosis is recommended.
How do I prevent my key fob battery from draining quickly? Avoid excessive button pressing and keep it away from extreme temperatures.
Where can I buy a replacement key fob battery? Most electronics stores, auto parts stores, and online retailers carry CR2032 batteries.