There are 26 different systems that can illuminate a check engine light.
The codes change for the different chassis (W124, W140), and model year (OBD-I vs. OBD-II).
You really need to post the model and year of your car.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".