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How to Replace the Battery in a Mercedes-Benz E320 Diesel Key?

2 Answers

MartinFitz

07/24/25 7:32pm

The back of the key has a button. Press this button and slide the back cover forward to open the key. The battery is located in the adjacent slot. Below is an introduction to the pros and cons of the Mercedes-Benz E320: 1. Pros: The Mercedes-Benz E320 Bluetec is not only more environmentally friendly and energy-efficient but also offers better acceleration performance and towing capacity. 2. Cons: Although the Mercedes-Benz E320 Bluetec diesel technology is advanced, it comes with a condition—it requires the use of ultra-low sulfur diesel. It is claimed that this type of diesel is 97% cleaner than the regular diesel previously sold in the U.S. This clean diesel only became available in the U.S. starting October 15, and naturally, it is more expensive than regular diesel. Even when used in conventional diesel engines, this diesel can reduce soot emissions by 10%. When used in next-generation diesel engines like the Mercedes Bluetec, it can reduce soot emissions by up to 95%.

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VonMia

08/11/25 10:47am

As someone who enjoys DIY car repairs, I've changed the battery for my Mercedes-Benz E320 diesel key several times. The key is usually foldable with a small groove on the back. Use a small screwdriver or nail clipper to gently pry open the casing, being careful not to apply too much force to avoid cracking the plastic. Once opened, you'll see a coin cell battery, typically a CR2032 or similar model. Remember its orientation—positive side up—to avoid mistakes. Remove the old battery, insert a new CR2032, and ensure it's firmly pressed against the contacts. Close the casing and test the unlock function by pressing the key buttons. You can buy this type of battery at any supermarket for just a few bucks. If the key still doesn't work after replacement, check if it's been dropped or has internal damage. If all else fails, visit a repair shop. The process is simple and quick, taking about ten minutes, perfect for DIY enthusiasts. Remember to regularly check the battery life to prevent unexpected issues.

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