Just reconsider that particular car. The CEL issue can be something innocuous, and ignorable, or something serious that could have you paying for the car all over again in repairs.

I am tempted to say if the dealership was sincere, they would already have fixed the problem. However, since they don't know whether they will sell the car, they won't invest in repairs. But from what you wrote, it sounds like they will not repair anything, just reset the codes.

I recommend finding a good tech who knows the car and can give you an honest opinion. If he/she says the CEL is a minor issue, then go ahead with it. Otheriwse, there are many more to choose from.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

For the peace of mind I just ordered an inspection by SGS for $99.50. I am curious about the results.

Thanks for all inputs. Nice, helpful people of the forum as always .

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE