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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.

General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperature must exceed -7°C.
Engine running. Main relay voltage exceeding 10V. Ignition discharge module combustion signals registering. The number of missing combustion signals is accumulated for each cylinder every 200 engine revolutions. The total number of accepted misfires during 200 engine revolutions is specified in a load and engine speed - dependent matrix.