Just had car inspected with no issues or emission faults but light comes on and on 2000 Saab 9-3

I feel a little hiccup in the engine from time to time but nothing more. What could this be? I have a rebuilt engine and turbo about 1.5 years old, new compressor and clutch so do not expect any issues.

Asked by for the 2000 Saab 9-3