Just replaced two key fob batteries on my 03 E500. Now keyless-go and both fobs do not work. Please advice.

 

Yes, all buttons do not work. I will try another set of new batteries. If it still does not operate anything will it need to be reprogrammed?

 

did the key/s worked prior to changing batteries or is that the reason why you changed em? im assuming both keys dont work with lockin/unlocking, what about with the ignition? if none of these works, Plutoe is right. goodluck mate!