I have a '98 C230 and had the same problem. It was diagnosed as needing a
tune up (when was yours last tuned up?), a new air mass sensor. There was
also a bad sensor in the gas tank. Also, if you don't get the gas cap back
on right or top off the tank or have a bad vent in the gas cap, it will trip
the light. NEVER top off the tank.
After the tune up, it runs like new. Lotta power again, smooth idle, good
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