David - Thanks for the attempt, but that procedure does not work for the 99 SLK 230. I tried it three times. Yes, I'm mechanically inclined - obviously, having changed the oil and filter today (which is why I'm trying to reset the FSS).

Does anyone have the owners manual for a 99 SLK 230? If so, please give me the details required to correct this FSS reset problem I'm having!

Thanks