Your owners manual should show you the process. There is a little tab near where the key pops out that must be depressed to slide the unit out of its cover.
To replace the battery on a Mercedes ml 350 key fob it is probably best to ask the supplier where it is purchased or there may be some instructions online.
With your key.
A new key for a ML 270 cost $370AUS
Replace the battery on your remote key. If you get the dealer to do it for you it is notoriously expensive. Did you try unlocking the passenger side with the key?
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remove the manual key then remove the top of the key and replace the two batteries cr2025.
The key comes apart from the top, you can use the blade key to push in the tab inside the key and at the same time pull the key apart
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I have a problem with my Mercedes Benz s350 2002 which the shass number of the Benz is 2200671a384480 and the engine number is vq30989871a.The problem is After i replace the battery with new one the key is not shocking again and i think it security problem.
remove key from fob and inside the hole theres a tab move it left and pull the bottom half out then u will see two batteries
I think its somewhere around $100 bucks? But not sure, I know it does have to be coded,programmed to the car once you get it so you can lock/unlock the car with the key.