Thanks, M.B. Doc.

A couple follow-up questions. I read on another forum with someone who had a similar problem. They thought that maybe certain brands of gas had something to do with it or that a faulty oxygen sensor may prevent the catalytic converter from heating properly. Could any of these also be possible causes? Wouldn't a faulty oxygen sensor trigger a warning? Is there anything that I could add to my gasoline that is MB approved to help?

Best-
Brian

__________________
Brian
'94 E420 - 99K
'12 C300 4 Matic

Previously owned:
'06 CLK 500K Cabriolet
'85 300SD (Old Smokey)
2002 Boxster
2002 C320 (The five-pointed star Mercedes)
1993 300E 3.2 (Dealership's cash cow)
1979 300SD (Chrome beauty)
1983 300D (Old faithful)
1983 240D (Right lane cruiser)
1977 240D (Miracle of bondo)