Just picked up an o4 E500 w211. It's got several electrical issues. One is the display tells me that something is wrong with the secondary battery, so the luxury features are off. It does that for a while. Then they come back on. Then off.
Also got within 2 miles of home and the ESP broken message came on (and stayed on.)
So, shy of these being super easy things all 211 owners deal with, my question is, what do I need and where do I begin? Is my first move to buy and icarsoft? or similar? Then what? Situation is NOT urgent, but I'd sure like to at least have the ESP functioning before December.
Thanks!

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Paul
2004 E500 4matic; 72,000mi