I was cycling through my Scanmaster the other day, and three codes came up without the engine light being on. One was 16, (Low Res Pulse on the Opti), 46 (PASS-Key II Circuit) and code 51 (EEPROM Programming Error). Since the light wasn't on, I'm kinda assuming these are old stored codes, since I replaced my Opti last year, and I had a problem with the PASS-Key system when I bought the car. However, I'm really confused about the EEPROM programming error. What causes this? If it can happen through reprogramming then thats out, since it hasn't been done yet. The car is running fine as far as I can tell.

Thanks,
Keith

 

I've had the same code come up before. I also had the opti and all the ignition codes pop up too at the same time. Never found out what caused it though.