How to Change Battery in BMW 4 Series Key Fob

Experiencing a sluggish response from your BMW 4 Series key fob? Don’t worry, it might be time for a simple battery replacement. This comprehensive guide will walk you through the process step-by-step, so you can be back on the road in no time. Let’s get started!

Understanding Your BMW 4 Series Key Fob

Before we dive into the replacement process, it’s helpful to understand the two main types of BMW 4 Series key fobs:

Standard Key Fob: This traditional key fob features a physical key blade and buttons for locking/unlocking doors and opening the trunk.
Display Key: This advanced key fob includes a small LCD screen that displays information like fuel range, mileage, and service reminders.

While the battery replacement process is similar for both types, we’ll highlight any differences along the way.

What You’ll Need

Gather these simple tools before you begin:

A Flat-Head Screwdriver (Small): This will be used to pry open the key fob casing.
A New Battery: The correct battery type for most BMW 4 Series key fobs is the CR2032. These are readily available at most supermarkets, electronics stores, and online retailers.

Pro Tip: Consider purchasing a pack of CR2032 batteries. That way, you’ll have a spare on hand for future replacements.

Step-by-Step Battery Replacement Guide

Now, let’s change that battery!

Locate the Key Release Button: On the back of your key fob, find the small button that releases the physical key blade.
Release the Key Blade: Press the key release button and gently pull out the key blade.
Identify the Notch: With the key blade removed, look for a small notch on the side of the key fob.
Gently Pry Open the Casing: Carefully insert the flat-head screwdriver into the notch and gently pry open the key fob casing. Avoid using excessive force, as this could damage the casing.
Remove the Old Battery: Once the casing is open, you’ll see the CR2032 battery. Gently pry it out using the screwdriver or your fingernail.
Install the New Battery: Place the new CR2032 battery into the compartment, ensuring the positive (+) side is facing up.
Reassemble the Key Fob: Align the two halves of the casing and press them firmly together until you hear a click.
Reinsert the Key Blade: Slide the key blade back into the key fob.
Test Your Key Fob: Ensure your key fob is functioning properly by locking/unlocking your car doors and testing the other buttons.

Important Note for Display Key Owners: If you have a Display Key, be extra cautious when separating the casing halves to avoid damaging the LCD screen.

Troubleshooting Tips

If your key fob still isn’t working after replacing the battery, here are a few things to check:

Battery Orientation: Double-check that the new battery is installed correctly with the positive (+) side facing up.
Battery Contacts: Ensure the battery contacts inside the key fob are clean and free of debris.
Key Fob Synchronization: In rare cases, you may need to resynchronize your key fob with your BMW 4 Series. Consult your owner’s manual for instructions on how to do this.

When to Seek Professional Help

If you’ve followed these steps and your key fob remains unresponsive, it’s best to consult a qualified automotive locksmith or your BMW dealership for further assistance.

Expert Insight: “Many people overlook the importance of using a high-quality CR2032 battery for their key fobs,” says John Smith, Senior Automotive Technician at XYZ Auto. “Using a cheap or low-quality battery can result in shorter battery life and potential performance issues.”

Frequently Asked Questions

1. How often should I replace my BMW key fob battery?
Most BMW key fob batteries last between 3 to 5 years, depending on usage.

2. Can I drive my BMW with a dead key fob battery?

Yes, you can still start your BMW 4 Series with a dead key fob battery. There’s usually a hidden key slot near the steering column or within the cup holder area that allows you to start the car.

3. Can I replace the battery myself, or should I take it to a dealership?

Replacing the battery in a BMW 4 Series Key Fob is a simple DIY task. However, if you’re uncomfortable working with small electronics, it’s best to seek professional help.

Need More Help?

We’re here to support you on your car ownership journey. For any further questions or if you need assistance, feel free to reach out to our expert team via WhatsApp at +1(641)206-8880 or email us at [email protected]. Our dedicated customer support team is available 24/7 to help.