Let me get out my crystal ball....
No, really, you need to give more information.
Did you pull codes? You have an easy to use code reader in your engine compartment near the battery.
Did you use the search function to find the instructions to do this?
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".