Please help me to deturmine fault?

My 1992 M119 had the check engine light came on after starting cold. The code reader light comes on when pushed and there are no codes stored. I checked codes again and got no codes and the check engine light was still on. I checked for codes again (none) and then held the button down for 45 seconds and then shut the key off for 45 sec and then on for 10+ and still have a check engine light and no codes.

Please let me know what i should do next, i am guessing that i need to replace harness but am holding off since my G/F may want something other that an wiring harness under the tre for the holidays.

Jeff AKA Moose

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Jeff (moose)

92 500E 90K miles stock less AMG chip

73 Datsun 240Z, 74 260Z, and a 75 280Z 2+2