Wow! awesome site!! So many replies. Thank you guys.

I am a new owner and have never had a Mercedes before. I am a totally newbie and being to the US, I don't even know how to maintain tire pressure. Before you all start laughing ... we get full service at no cost back in India.

I will check the things all of you helpful people suggested. I did not there is a way to read the fault code without going to the service station.

I will post what I find.

CEL was on before I went to change the oil. And since the car has bottom plate, I did not see an oil drip when parked.

Thanks,
Kalyan

EDIT: I think I am going to go in to Autozone to diagnose for now, if they offer it for free. At the moment, I am not sure I can do the self help steps confidently. I will post back what I find out.