Have Mercedes Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
From what you have described here your vehicles anti theft system has engaged and has disabled the starting.This can occur like this here when the battery is replaced.What needs to be done is to have the anti theft system relearned.This usually requires a dealers computer to do this with your vehicle at the dealer unfortunately.They will usually charge around an hours labor to do this relearn.
In some cases just locking and unlocking the doors or leaving the key in the ignition will reset the anti theft system and allow starting.If this doesnt work after doing this for several minutes then it does need relearned and usually by a dealer.
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