The local benz dealership told me the CEL was caused by a bad MAF sensor , so I bought one from them and it did not fix the problem.I reset my codes on the 2000 ml 320 today, and the CE light came on again after 5 minutes. there is no difference between my old one and this new one, the car still runs like crap, it wont accelerate, it has no power. Did anyone have any problems with their Catalyc Converters, I think that they don't have a good flow and it sounds like the exhaust is leaking, right after the manifold but before the cat. It is leaking on the exhaust gasket i think. Please, if anyone had the same problem or any suggestions, i would appriciate it. thanks a lot.