How to Replace the Battery in a 2008 Mercedes-Benz S550 Key Fob

How to Replace the Battery in a 2008 Mercedes-Benz S550 Key Fob

Remote key fob allow access to your S550. When the key fob battery is discharged you lose your fob’s ability to use remote opening function. In this article, we are going to tell you how to open your keyless entry remote and replace a dead or weak battery yourself. If you decide to do it at home near S550, use this instruction, but first make sure you have everything you need.

What size battery does 2008 Mercedes-Benz S550 key fob take

Before going to disassembly keyless entry remote make sure that you have all required tools and materials: flat head screwdriver and 2xCR2025 batteries.
  • flat head screwdriver
  • 2xCR2025 batteries

Step by step guide

A button cell battery installed in the your keyless entry remote. Move the key out of the way if it is in the remote key fob.

Carefully try to open your key with pry tools. Remove CR2025 batteries with flat head screwdriver.

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

Before assembling keyless entry fob's case, make sure that all functions works by testing buttons on remote key fob.

The last thing to do is put your cover back on fob. Accurately try to put the pieces together by hands from top to bottom. If your fob body tightly closed, we done. If not, repeat the last step.

Video of key disassembly

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Still not working? Buy new one

Frequently Asked Questions

Remote key fob of Mercedes-Benz S550 use 2xCR2025 batteries. Most CR2025 batteries are under $5 depending on the size packaging, brand and type you buy. Take your old battery to the store, with you to find a proper replacement.

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

Changing your keyless entry remote battery is easy to do in 2008 Mercedes-Benz S550. Most of car manufacturers think about customers and make a special hole for key fob open.

Auto repair shop's price for replace the battery in fob is from 50 to 600 dollars depending on the brand.

You should change batteries inside remote key fob of modern cars at least every three years. lifespan of battery vary on their amount of use, operating conditions and quality. Famous brands cells normally will last longer.

If your Mercedes-Benz key fob buttons not working, has low key battery indicator on dashboard, need multiple clicks to unlock or lock doors or signal strength reduced, in most cases battery change inside key fob needed. Currently installed battery is discharged with a high probability, but if it's not fix problem, fob change or repair required.
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Fob Compatibility:

  1. FCC ID: IYZ3317
  2. Models: 2007-2012 Mercedes-Benz S550