How to Replace the Battery in a 1998 Mercedes-Benz E420 Key Fob

How to Replace the Battery in a 1998 Mercedes-Benz E420 Key Fob

If your Mercedes-Benz key fob is no longer working properly, the battery probably needs to be replaced. Below, we outlined how to disassembly your car key fob and replace your Mercedes-Benz key battery step by step.

What size battery does 1998 Mercedes-Benz E420 remote key fob required

Before starting open keyless entry remote be sure that you have all recommended tools and materials: 2xCR2025 batteries and flat head screwdriver.
  • flat head screwdriver
  • 2xCR2025 batteries

Simple steps to change the battery in your car's remote key fob

Inside of your key fob installed small button cell battery. Move the key out of the way if it is in the remote key fob.

Carefully try to pry apart your key with hands or flat head screwdriver. Replace two CR2025 batteries with flat head screwdriver.

Replace old batteries with new 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 position on battery, by "+" mark.

After the new batteries installed, verify remote key fob by pressing buttons. If everything working good, assemble your keyless entry fob's body in reverse order.

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

How to change the battery video guide

SOLVED - Mercedes Benz Keyfob Battery Replacement | Smart Key Fob Dead Batteries

Still not working? Buy new one

Frequently Asked Questions

Remote key fob of Mercedes-Benz E420 require 2xCR2025 batteries. Price for CR2025 batteries are under $5 depending on the size packaging, brand and type you buy. You can take old battery to the store, to find a proper replacement.

Usually, after key fob battery change, reprogramming not required. Don't be scare of this procedure, because often it's described in user's manual.

Changing your remote key fob battery is easy to do in 1998 Mercedes-Benz E420. Most of car manufacturers think of the customers and make a special hole for keyless entry remote open.

The price to replace the battery in remote key fob can run anywhere from $30 to as high as $500 depending on the car and the service station.

You should change batteries inside remote key fob of Mercedes-Benz E420 at least once in 4 years. lifespan of battery differ on frequency of use, operating conditions and quality.

If your E420 need multiple clicks to unlock or lock doors, key fob buttons not working, has low key battery indicator on dashboard or fob's battery more than 4 years old, in most cases battery replace inside remote key fob needed. Installed battery is dead with a high probability, but if it's not fix problem, keyless entry remote replace or repair required.
Be the first to comment.
Your message is required.

Other Mercedes-Benz Models:

Fob Compatibility:

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