Question about 2000 Mercedes-Benz S-Class

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How to change the battery in the key fog

I have a 2000 SL500 Mercedes, needs a new battery in the key fob

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  • Anonymous Mar 21, 2014

    have just bought a second hand Yaris was absolutley fine battery needed changing in key fob, now can not get it to start or do anything



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I had the s500 2001... so u have to take the steel emergency key off then introduce it obliqually and push it will open! ...not easy to explain better but any mercedes service can help u easily and quickly!

Posted on Jan 08, 2009


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What would calls my key fog not to work after replacing the battery and testing it but will not work still on my 2000 Jeep XJ

cause, my.
fob not fog.
the car came with 2 fobs do both fail
never have just 1 fob.
or you will be stranded, and worse costs big time to fix.
a backup key even for SKIM systems can be had cheap.
i have a no fob key that works (skim ) for $13 on my JK jeep.
1: check all fuses first.
2: check that the battery in car is 100% charged, 12.6vdc rested.
3: plug in any Scan tool, got skim errors, report them. (like bad key)
4; lots more... but this gets most.

pull charged battery for 1hr, (neg lug off ) and put back .
no all is reset. try 1 more time.
and with both keys, this time.

Feb 22, 2015 | Jeep Cars & Trucks

1 Answer


The key could be worn down to a point that it isn't fully moving the tumbler. Could be that the ignition lock has been tampered with in such a way that it will no longer respond to the key. If you have a second key that isn't used as much try it; if it works, it's your first key, if it doesn't you might need a new ignition switch.

Oct 04, 2014 | 2005 Mercedes-Benz S 430

1 Answer

Mercedes benz c220 cdi 2001 coupe remote key doesnt work

new battery in fob doesnt mean it cant be faulty retry with a different new battery and or that it is installed correctly -also sometimes a fob will have to be relearned or flashed and that usually means a visit to dealer or service station thats authorized to do so--and if their was rust and oxidation i would recheck and reclean those components again and test continuity

Apr 08, 2014 | Mercedes-Benz C-Class Cars & Trucks

1 Answer

CL220, fob wont open doors I can't get in the car, does this mean the battery is flat?

battery may be flat in the fob or the vehicle has forgotten the code for the fob. and will need resetting. change the battery use the key to open the door put key in the ignition. ( fob Ir old type leave fob off the key) turn to number 2 and press fob till doors lock and unlock. then its reset. dont be worried if the alarm goes off while doing this it will go off when the code is restored. if you have 2 fobs you will need to rest that one to.

Mar 17, 2014 | Mercedes-Benz C-Class Cars & Trucks

1 Answer

Mercedes vito van, keys will do nothing, they have new battery in the keys, but they will not aperate the remote doors or turn in the ignition

When you changed the batteries, you wiped the former codes ... you must reset the codes to your vehicle. You dont mention the year or model so it is difficult to give more specific information. I am certain that if you will contact a dealer in your area, they can advise you on this matter. Thin k about this ... if when the batteries were changed, all fobs worked, it would be really easy to steal any mercedes you wanted using amy fob you wanted. This is for your protection.

Dec 20, 2012 | Mercedes-Benz Cars & Trucks

3 Answers

Reprogramming key fob after changing the battery

were talking about the key fob battery.right?? try holding both the lock and unlock buttons at the same time while pointing the key fob at dashboard/drivers side door area.give it at least 10-20 seconds and see if that resets it.

Sep 14, 2009 | 2001 Mercedes-Benz C-Class

1 Answer

Mercedes 1999 c200 key fob

Hello Haq!
Could it be the key just needs re-coding? maybe you are worrying to much as £177 would be about right as that would need coding etc., Try phoning your local Merc dealer or take the key and V5 to them for coding (Hopefully)
Good Luck!
Paul 'W'

Jan 06, 2009 | 1998 Mercedes-Benz C-Class

3 Answers

Mercedes S320 central lock

if you hav a remote control key &yr car wont respond . change key batrrey &contact dealer if still dont work for software

Jul 13, 2008 | 1994 Mercedes-Benz S-Class

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