Why can't they et the "check engine light" to go off? on 2006 Mercedes-Benz E320 CDI

My car was in a rear end collision and the check engine light came on. The car has been fixed and the check engine light is still on. They told me that the filter needed replacing so they did that; $300 later and the check engine light is still on. Any suggestions?

by in Dallas, TX on February 10, 2014
2 answers 2 comments
ANSWER by on February 10, 2014
What is the code for the engine light.
ANSWER by on February 10, 2014
have them scan the codes and post so we can adv. very poss an evap leak in fuel system since car was hit in the rear.
COMMENT by on February 10, 2014
OKay, I'm not sure how to find the codes. Do they need to tell me the codes from the computer scan or will they display in my console?
COMMENT by on February 10, 2014
Get the codes from the computer scan, all modules.