Rear spring sensor malfunction can cause the rear suspension to sag requiring recalibration of the sensors.
Car problem reports
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Most reported 2006 Saab 9-7x problems
The trunk module can fail causing the tailgate to malfunction when opening or closing.
Leaks in the air suspension can cause the air compressor to run constantly.
The fuel level sender can malfunction causing the fuel gauge to always read at the full level.
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.
The wiring for the transfer case speed sensor can fail causing sporadic operation of the AWD (All Wheel Drive) system.
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.
Oil can leak from the oil pressure sensor causing a loss of pressure at the sensor and illumination of the oil light.
The Vehicle Communications Interface Module can fail causing On-Star to not function properly.
The right/front seat belt retractor assembly can fail causing illumination of the SRS warning light.