Could be that the dash light is indicating another problem. Is yours a model with a button and LED in a (X11) connector along the firewall? If so, set the key to #2 position (just before the starter engages), press the button for 2 seconds, then count flashes. Press the button for another 2 seconds and check for other codes. The codes will repeat in ascending sequence.

Sixto
95 S420
87 300SDL