You may have to drive the car for at least 100 miles for the system to reset itself. At least thats what I had to do in my 98 C230. This prevents you from disconnecting the battery to get rid of the CEL and pass an emission inspection. The system won't be ready ubtil you drive it for a while.

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John


1998 C230 for the wife
1986 Porsche 944 Turbo for me in the summer
1993 Audi 90 for me in the winter