I dought that the gas had anything to do with it setting a code, unless the gas had water, or some other nasty contamination. In such a case, it probably would not have set a code, it would just run real bad or quit altogether.
Teh problem is most likely related to the recurring code set.
You really won't know until you see what the code is.
Best of luck,
'01 C Class, Six Speed
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
[This message has been edited by LarryBible (edited 10-10-2000).]