How to Open Your 1996 Mercedes-Benz S420 Key Fob & Change Battery

How to Open Your 1996 Mercedes-Benz S420 Key Fob & Change Battery

Remote key fob grant easy access to your Mercedes-Benz. Once the key battery is weak you will not to be able close car remotely. It's not complicated to change the battery in your remote key fob by yourself. Everything you need is described in this post.

What is the battery key fob require

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

Simple steps to replace the battery in your S420's remote key fob

Inside of your keyless entry remote installed tiny coin battery. Open the key if it is in the remote key fob.

Accurately try to open your remote key fob with flat head screwdriver. Remove 2xCR2025 batteries with flat head screwdriver.

Replace old batteries with fresh one CR2025. Battery must be installed with the same position as was a previous. Your key fob will not work if you mistakenly put battery wrong way.

When the new batteries installed, verify remote key fob functionality by pressing buttons. If all functions works, assemble your keyless entry fob's case in reverse order.

The last thing to do is put your cover back on fob. Gently try to assemble the pieces in place by hands from top to bottom. If your keyless entry remote case tightly closed, we done. If not, repeat the last step.

Key Fob Battery Replacement 1996 Mercedes-Benz S420 Video

How To Replace Mercedes Benz S420 Key Fob Battery 1998 1999

Still not working? Buy new one


Keyless entry remote of Mercedes-Benz S420 use 2xCR2025 batteries. Most CR2025 batteries are under $4 build upon the brand, type and size packaging you buy. Take your old battery to the store, to find a proper replacement.

Usually, after key battery replace, you do not need to reprogram. Don't be scare of this procedure, because often it's described in user's manual.

Replacing your remote key fob battery is easy to do in 1996 Mercedes-Benz S420. Most of car manufacturers think about customers and make a special hole for keyless entry remote open.

Dealer service price for change the battery in remote key fob is $50-600 depending on the car.

You should change batteries inside key fob of Mercedes-Benz S420 at least once in 4 years. The term of battery differ on frequency of use, operating conditions and quality.

These signs will warning you that it's possible time to change battery in your 1996 Mercedes-Benz S420: low key battery indicator on dashboard, key fob buttons not working, signal strength reduced and you didn't change battery more than 4 years.
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Fob Compatibility:

  1. FCC ID: KR 55
  2. Models: 1995-1999 Mercedes-Benz S420