If the engine will crank but not start, it may be the fuel pump has failed. Diagnosis may find no fuel pressure when attempting to start the engine.
Car Problem Reports
Saab 9-5 Crank but No Start Condition and No Fuel Pressure
Saab 9-5 Problem
Engines Affected: 2.3L 4 Cylinder Turbo, 3.0L V6 Turbo
Average Mileage: 99,000 mi (83,000 mi - 115,000 mi)