1999 lexus check engine lights on - 2000 Saab 9-3 Viggen

Hi Angie:
The check engine light is reserved only for Powertrain problems that could have an impact on the emissions systems.

Exactly what the OBD system looks for depends on the make, model and year. The original systems varied widely in their capabilities. Some did little more than check whether the various electronic sensors and actuators were hooked up and working.

I suggest scanned the PCM computer (Powertrain COntrol Module) to know exactly what fault code is stored there.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.