Https://www.youtube.com/watch?v=UR7m9n_5Fww
Not sure what year your motor is,, but this should help
SOURCE: i need the manual book for mercedes e270 cdi avantgarde model 200
how to reset the service light on mercedes benz e270 cdi avantgarde
SOURCE: 2004 E270 CDI Battery light visit workshop
I had the same problem in me 2004 cdi e270. Check the voltage going to the battery when the car engine is on. Stedy charge of 12v should be going in to the battery, if the voltage is volitale say between 11v to 14v then it your Regulator (which is attached to the backend of the alternator). You need to change alternator and then unplug all the batteries over night and re plug them back again. The problem should go away.
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