Self-Diagnostic System: Notes
WARNING: This page is about a different car, the 1997 Mercedes-Benz E300. However, it is still accessible from the selected car via links, so may be relevant.
The Inline Fuel Injection (IFI) control module is equipped with a self-diagnostic capability for trouble shooting. Diagnostic Trouble Code (DTC) memory remains active if ignition is turned off or battery is disconnected. The CHECK ENGINE Malfunction Indicator Light (MIL) will illuminate to indicate severe faults.