Originally Posted by Mike Benvo
Yes, quite possible.
Many cars come in with faults and have no SES light.
The SES light will only illuminate if something continues to reoccur, or if it's something more serious. There are also many faults that may not trigger the light.
As an example, when my idle control valve was bad, the car misfired in all eight cylinders and had 9 fault codes stored (one for each cylinder + a multiple misfire code). No warnings, and this is with the latest stock software. You should be able to read any existing fault codes with your tuning cable
I see, thanks. Too bad I don't have a PC. I don't have the software either. I thought I heard someone say that the software is on the cable?!?!