2005 Mercedes E-Class Owner's Manual - Page 361

Practical hints What to do if ... Problem Possible cause (USA only) (Canada only) The yellow engine malfunction indicator lamp comes on while driving. There is a malfunction in: The fuel management system The ignition system (Gasoline engine) The emission control system Systems which affect emissions Such malfunctions may result in excessive emissions values and may switch the engine to its limp-home (emergency operation) mode. Suggested solution Have the vehicle checked as soon as possible by an authorized Mercedes-Benz Center. An on-board diagnostic connector is used by the service station to link the vehicle to the shop diagnostics system. It allows the accurate identification of system malfunctions through the readout of diagnostic trouble codes. It is located in the front left area of the footwell next to the parking brake. ? ± A loss of pressure has been detected in the Check the fuel cap. fuel system. The fuel cap may not be closed If it is not closed properly: properly or the fuel system may be leaky. Close the fuel cap. If it is closed properly: Have the fuel system checked by an authorized Mercedes-Benz Center. 359