We take a break from 350Z stuff to save Marcus’ GS300. Over the last couple years, Marcus has had me work on his ECU to transfer his immobilizer key data EEPROM (IC900) to a new board to help resolve some transmission issues. Well, now the worst case scenario has shown itself. He broke his keys, and now it won’t start. When these ECU’s won’t accept anymore keys, and the dealership tools don’t help reset the key data, you have to take matters into your own hands, desoldering, and reprogramming the key data in the EEPROM. This video shows you how to do that, easily.