How to Change Battery in Mercedes 2009 E350 Key Fob

Experiencing a flashing dashboard light or struggling to unlock your Mercedes E350? It might be time for a new key fob battery. Don’t worry, this is a common issue and something you can easily tackle yourself. This guide provides a step-by-step walkthrough on how to change the battery in your 2009 Mercedes E350 key fob.

What You’ll Need

Before diving in, gather the following:

• A fresh CR2032 battery: This is the standard battery for most Mercedes key fobs, including the 2009 E350.
• A small flat-head screwdriver: This will be used to pry open the key fob casing.

Step-by-Step Guide

Now, let’s get to the heart of the matter: replacing that battery.

1. Locate the release button: On the back of your key fob, you’ll find a small, silver button.
2. Release the metal key: Press the release button and gently slide the metal key out of the fob.
3. Separate the fob casing: Using your flat-head screwdriver, carefully insert it into the groove on the side of the fob. Gently pry open the casing. You should hear a slight click when it separates.
4. Remove the old battery: Inside the fob, you’ll see the CR2032 battery. Gently pry it out, noting the positive (+) and negative (-) sides.
5. Insert the new battery: Place the new battery in the same orientation as the old one, ensuring the positive (+) side is facing up.
6. Reassemble the fob: Carefully align the two halves of the casing and press them together until you hear a click.
7. Reinsert the metal key: Slide the metal key back into its slot on the fob.

And that’s it! You’ve successfully changed the battery in your 2009 Mercedes E350 key fob.

Troubleshooting Tips

• Still having issues? Double-check that the new battery is properly installed and that the positive (+) side is facing up.
• Key fob not responding at all? You might need to re-synchronize it with your car. Refer to your Mercedes owner’s manual for specific instructions on how to do this.

Pro Tip from John Miller, Senior Automotive Technician: “Always use a high-quality CR2032 battery for your Mercedes key fob. Cheaper batteries may leak or die quickly, leading to frustration.”

Changing the battery in your 2009 Mercedes E350 key fob is a quick and easy process. With a few simple tools and these clear instructions, you can save yourself a trip to the dealership and keep your car running smoothly.

Frequently Asked Questions

How often should I change my key fob battery?

Typically, a Mercedes key fob battery will last between 3-5 years. However, it’s a good idea to replace it sooner if you notice your key fob’s range decreasing or if you need to be unusually close to your car for it to unlock.

Can I use any CR2032 battery?

While any CR2032 battery will technically fit, it’s recommended to use a high-quality battery from a reputable brand. This will ensure the battery lasts longer and performs optimally.

What if I replace the battery and my key fob still doesn’t work?

If you’ve replaced the battery correctly and your key fob still isn’t working, there might be another issue, such as a faulty key fob or a problem with your car’s receiver. In this case, it’s best to consult a qualified Mercedes technician.

Need more help with your Mercedes? Check out these other helpful articles on KeyFobX:

• [How to Program a Mercedes Key Fob](link to relevant article)
• [Common Mercedes Key Fob Problems and Solutions](link to relevant article)

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