Leaks in the air suspension can cause the air compressor to run constantly.
Car problem reports
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Most reported 2009 Saab 9-7x problems
If a groaning noise is heard from the rear of the vehicle while making turns, the limited slip differential should be inspected. Components should be inspected and replaced as needed.
Porosity in the rear of the engine block can cause oil leakage around the rear engine cover. Porosity may be found at rear of the engine and the repair procedure in the service bulletin describes using RTV silicone sealant to fill the porosity. There is also an updated rear engine cover for when porosity is found on the gasket mating surface.