Steve

Great response. Maybe MercedesShop needs another hired gun. It's evening now so I will hook up the meter tomorrow.

I can tell you that the problem did disapear today for a while. Is that possible for a failing O2 sensor? I wish I could say the problem vanished because I fiddled with something but all I did was wash it this weekend (LOL).

Lee, still waiting for the the O2 quote.