I have replaced a handfull of these computers for this. The problem usually only happened in the warm (hot) climate.
There is no real ill effect that I am aware of other than the light being on and increased emmissions and power.
I think if run.exe could crack the e-prom code, we could reprogram the old chip to work right for 10.00 dollars.
Anyway, that is a fantasy I think.
Good luck with the repair.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS