I recently purchased a 2004 E320 Wagon. After I got her home I locked her up using the electronic key. The next morning the electronic key would not unlock the system so I used the metal key which set off the alarm. Changed the battery in the electronic key which did not improve things. I then decided to purchase a new key.

Initially the new key worked well, for about three cycles! The last time that I was able to make it work a warning popped up that said something about the battery but the screen changed to "take it to a service station" so I wasn't able to get all of the message.

Any help or suggestions would be deeply appreciated. Thank you in advance!

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Roc

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