2003 Mercedes-Benz C240 Key Fob Battery Replacement Guide

2003 Mercedes-Benz C240 Key Fob Battery Replacement Guide

Keyless entry remote allow easy access to your C240. Once the remote key fob battery is dead or weak you will not to be able open doors from distance. Yes, it is possible to change the battery in your keyless entry remote DIY. All you need is explained in this post.

What type battery does 2003 Mercedes-Benz C240 keyless entry remote required

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

Step by step guide

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

Delicately try to pry apart your fob with pry tools. Change 2xCR2025 batteries with flat head screwdriver.

Replace old batteries with fresh one CR2025. Battery must be installed with the same position as was an old. Your key will not work if you by mistake place battery wrong way.

Before assembling fob’s case, check that all functions works by pressing buttons on circuit board.

At this point squeeze fob’s back cover together. Line your body two halves together and put it together by hands from top to bottom. If your fob case firmly closed, we done. If not, repeat the last step.

Video of remote key fob disassembly

Mercedes Benz Key Fob Case Change and Battery Replacement Remote

Still not working? Buy new one


Key fob of Mercedes-Benz C240 use 2xCR2025 batteries. Most CR2025 batteries are under $4-6 depending on the brand, size packaging and type you buy. You can take old battery to the store, to be sure.

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

Yes, you can replace battery in your 2003 Mercedes-Benz C240 remote key fob yourself. Most hard part is to disassembly keyless entry fob's case. It's pretty simple with our instruction.

Car service price for change the battery in fob is $50-600 depending on the brand.

Remote key fob batteries in modern cars should be replaced once in three years, but this will vary based on usage and build quality. If your key fob shortened signal strength, you should replace batteries before it stop close doors and make trouble for you.

If your C240 signal strength reduced, need multiple clicks to unlock or lock doors, fob's battery more than 4 years old or key fob buttons not working, it's probably battery replace in remote key fob required. Currently installed battery is discharged with a high probability, but if it's not help to fix issues, key change or repair needed.
Be the first to comment.
Your message is required.

Fob Compatibility:

  2. Models: 2001-2005 Mercedes-Benz C240