The wife's 2000 ML320 had a CEL this weekend that went out on its own. I had her go ahead and take it in. I told her that I bet I could guess which part they replace. Sure enough, I was right. All this time reading about all the part failures on the ML and keeping up with my own list left me with only three parts that hadn't been done yet. MAF, Crank sensor and fuel pump. Now awaiting the CPS and pump.