Replace Key Fob Batteries

1999 Mercedes-Benz E420 Key Fob Battery Replacement Instructions

1999 Mercedes-Benz E420 Key Fob Battery Replacement Instructions

If your Mercedes-Benz keyless entry remote is no longer open doors perfectly, the cell battery surely must to be replaced. In this case, we are going to tell you how to open Mercedes-Benz remote key fob and replace a discharged battery DIY. If you choose to do it at home near E420, follow our guide, but first make sure you have tools and materials required.

What size battery does 1999 Mercedes-Benz E420 remote key fob required

Changing batteries in key fob require flat head screwdriver and two CR2025 batteries. Prepare these materials and tools before opening and make sure to match the type of your fob’s batteries.
  • 2xCR2025 batteries
  • flat head screwdriver

Step by step instruction

A coin battery installed in the your key fob. Remove any internal key before you try to pry apart the remote key fob.

Gently try to pry apart your keyless entry remote with flat head screwdriver. Remove 2xCR2025 batteries with flat head screwdriver.

Replace old batteries with fresh one CR2025. Every battery has a negative and positive side and if you put the wrong connector down, the current cannot go into your circuit board and make it work. Check polarity on battery, by "+" mark.

Before assembling keyless entry fob's case, make sure that all is functioning by testing buttons on keyless entry remote.

The last thing to do is put your cover back on fob. Delicately try to assemble the two halves in place by hands from top to bottom. Check your remote key fob body for gaps. If it is not tightly closed try to repeat last step.

Video of keyless entry remote opening

How To Replace A 1995 - 1999 Mercedes Benz Flip Open Switch Blade Style Key Fob Battery FCC ID KR 55

Still not working? Buy new one

Frequently Asked Questions

Remote key fob of Mercedes-Benz E420 require 2xCR2025 batteries. Most CR2025 batteries are under $6 depending on the size packaging, brand and type you buy. You can take old battery to the store, with you to find a proper replacement.

Keyless entry remote in most of cases do not require to be reprogrammed after battery change. If your key not working, recheck new battery voltage. If it is not help, read user's manual or contact local dealer.

Replacing your remote key fob battery is easy to do in 1999 Mercedes-Benz E420. Most of car manufacturers think about customers and make a special hole for key fob disassembly.

The cost to replace the battery inside key fob is from $30 to as high as $500 depending on the car and the service station.

Keyless entry remote batteries in modern cars should be replaced once in three or four years, but this will differ based on usage and quality. If your remote key fob reduced signal strength, you should change batteries before it stop close doors and make trouble for you.

These symptoms will alert you that it's probably time to change battery in your Mercedes-Benz E420: low key battery indicator on dashboard, you didn't change battery more than 4 years, key fob buttons not working and signal strength reduced.
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Contents:

  1. Battery Size and Tools
  2. Replacement Guide
  3. Video Instruction
  4. FAQ

Other Mercedes-Benz Models:

Fob Compatibility:

  1. FCC ID: IYZ VECTOR
  2. Models: 1998-1999 Mercedes-Benz E420