Isn't there a guide in the owner's manual for this? Anyway, if the key now
only works close to the car, the issue could be the radio receiver at the
car instead of the key (always good to check the key batteries though).
The key (on modern MBs at least) works on both IR and RF. If the RF dies,
you need to point to the IR receivers at the door to open the doors. But you
do need key battery power for this too. Not sure if IR works at lower
battery levels than RF, in that case it could still be the battery in the
key. By the way, is it the same with the other key?
I am having the same problem with my 2001 C240. It was not diagnosed
until the warrantee expired. It is a radio frequency amp in the roof
near the back window. I had so many mechanics look at me like I was
crazy because I said the remote and the radio reception were weak at
the same time. Of course every time this was mentioned the Basics 101
question was asked, "Did you check the batteries in the fob?". Yes!
"Maybe its a fuse." I checked all that before I took it for service
but they did not believe me.
> The key fob on my 2001 C240 has gotten sluggish and will only
> work at a close distance. Is there a battery in the fob to be
> changed? If so, how do I get at it?
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