Ignition discharge module: Misfiring

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

Emission -related misfiring will generate diagnostic trouble code P0300 -P0304.
If catalyst damaging misfiring occurs, diagnostic trouble code P1300 -P1304 will be generated. CHECK ENGINE will flash during the misfiring.
If catalyst damaging misfiring occurs in conjunction with a fuel level below 4 litres, diagnostic trouble code P1390-P1394 will be generated. CHECK ENGINE will flash during the misfiring.